单选题You should not divide the fresh water（）three trips.A inB intoC toD for

题目
单选题
You should not divide the fresh water（）three trips.
A

in

B

into

C

to

D

for

相似考题

1.I should have to divide the class into three groups and teach them _________ at three different levels.A. by turnB. for turnC. in turnD. of turn

2.how can you create good vacuum on the fresh water (FW) distiller ?

3.When you're _t_________ ,you should have some water．

4.BThe world is not only hungry，it is also thirsty for water． this may seem strange to you，since nearly 75% of the earth is covered with water． But about 97% of this water is sea water．Man can only drink and use the other 3% fresh water that comes from rivers，lakes，under-ground and other places． And we cannot even use all of that，because some of this fresh water has been made dirty．At the moment，this small amount(数量) of fresh water is still enough for us． However，our need for water is getting greater and greater． Only if we take steps to solve this problem now，we can get away from a serious world water shortage later on． The people of the world cannot have an enjoyable life without enough clean water．On one hand we should stop wasting this little water of ours，on the other hand we should find ways to reuse it，but this has not been done widely．Today，in most large cities，water is used only once and it then returns to the sea or runs into underground places．lf we can make it clean again，it can be used once more just as if it were fresh from a spring．But even if large cities reuse its water，we still would not have enough in the future． Where．could we turn to next for water? To the ocean! How can we do to make use of this great a-mount of sea water? We can take the salt from the water to make it fresh．So if we take all these steps，we'll be in no danger of drying up!( )26． Why does the writer say that the world is thirsty for water?A． The amount of fresh water is really very small．B． The people of the world waste too much water．C． The people of the world have to drink a lot of water every day．D． There are too many people in the world needing water．

参考答案和解析
正确答案： D
解析： 暂无解析
更多“You should not divide the fresh water（）three trips.”相关问题

  • 第1题：

    7． If you were in Sahara，you ________ the value of fresh water．

    A． will realize

    B． realized

    C． would realize

    D． realize


    正确答案：C
    7．C【解析】虚拟语气。

  • 第2题：

    共用题干
    The Drink Your Body Needs Most

    I Our bodies are estimated to be about 60% to 70% water. Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water. Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine, along with a yellow
    color indicates that you are not getting enough water. Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your bod犷weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20
    minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water. When you are traveling on an airplane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    The amount of water your body needs per day is closely related________.
    A:in your body
    B:without water
    C:before long
    D:for a change
    E:on a busy day
    F:to your weight

    答案：F
    解析：

  • 第3题：

    共用题干
    The Drink Your Body Needs Most

    I Our bodies are estimated to be about 60% to 70% water. Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water. Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine, along with a yellow
    color indicates that you are not getting enough water. Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your bod犷weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20
    minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water. When you are traveling on an airplane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    Dehydration may occur if there is a shortage of water_________.
    A:in your body
    B:without water
    C:before long
    D:for a change
    E:on a busy day
    F:to your weight

    答案：A
    解析：

  • 第4题：

    共用题干
    The Drink Your Body Needs Most
    1. Our bodies are estimated to be about 60%to 70%water. Blood is mostly water, and our mus- dles,lungs and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients（滋养物）to travel to all our organs. Water also transports oxy-gen to our cells,removes waste,and protects our joints and organs.
    2. We lose water through urination（排尿）, respiration（呼吸）, and by sweating. If you are very active,you lose more water than if you do not take much exercise.Symptoms of mild dehydration （脱水）include chronic pains in joints and muscles,lower back pain,headaches,and constipation
    （便秘）.A strong smell to your urine,along with a yellow color indicates that you are not getting enough water. Thirst is an obvious sign of dehydration and in fact,you need water long before you feel thirsty.
    3 .A good rule of thumb（好的做法）is to take your body weight in pounds and divide that num- her in half. That gives you the number of ounces（盎司）of water per day that you need.For ex-ample,if you weigh 160 pounds,you should drink at least 80 ounces of water per day.If you ex- ercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal amount of water. When you are traveling on an airplane,it is good to have 8 ounces of water for every hour you are on board the plane.
    4 .It may be difficult to drink enough water on a busy day.Be sure you have water handy at all times by keeping a bottle for water with you when you are working,traveling,or exercising. If you get bored with plain water,add a bit of lemon for a touch of flavor. There are some brands of fla-vored water available,but some of them have sugar or artificial sweeteners that you don't need.

    The amount of water your body needs per day is related_________.
    A: in your body
    B: without water
    C: before long
    D: for a change
    E: on a busy day
    F: to your weight

    答案：F
    解析：
    第一段讲到人体约60％～70％是由水组成的；血液大部分都是水，体温的调节，运输滋养物到各个器官，运送氧气到各个细胞，废物排除，人体关节和器官的保护等都离不开水。故本段主要讲的是水对人体的重要性。故选B。


    第二段首句讲到我们通过排尿、呼吸和流汗流失水分。第三句开始主要讲的是脱水的表现。它包括关节与肌肉的慢性疼痛、腰痛、头痛、便秘、口渴等。故选D。


    第三段首句讲的是人体每天所需的饮水量，即一个人每天所需的基本饮水量单位以盎司计，数量是体重磅数的一半。并介绍了在一些特殊情况下所需的饮水量。


    第四段主要讲的是随身携带水瓶及时饮水的必要性。此段首句讲到在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，如果嫌水无味，可以加点柠檬。


    由第一段“Our bodies are estimated to be about 60% to 70% water. Blood is mostly water”可知，人体约60%～ 70％是由水组成的，而且人体自身的新陈代谢和机体的运行都离不开水，因此人离开水是活不下去的，故选B。


    由第二段“Symptoms of mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain, headaches , and constipation（便秘）”可知，人体严重缺水便会产生脱水现象，并伴有关节和肌肉疼痛、背痛等症状。故选A。


    由第三段“A good rule of thumb（好的做法）is to take your body weight in pounds and divide that number in half. That gives you the number of ounces（盎司）of water per day that you need.”可知，我们可以把体重用盎司表示出来，盎司的一半就是我们需要的基本饮水量，因此人体每天所需的饮水量与人的体重有密切关系，故选F。


    由第四段“It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working…”可知，在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，即使再忙也不要忘了喝水，故选E。

  • 第5题：

    共用题干
    The Drink Your Body Needs Most
    1. Our bodies are estimated to be about 60%to 70%water. Blood is mostly water, and our mus- dles,lungs and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients（滋养物）to travel to all our organs. Water also transports oxy-gen to our cells,removes waste,and protects our joints and organs.
    2. We lose water through urination（排尿）, respiration（呼吸）, and by sweating. If you are very active,you lose more water than if you do not take much exercise.Symptoms of mild dehydration （脱水）include chronic pains in joints and muscles,lower back pain,headaches,and constipation
    （便秘）.A strong smell to your urine,along with a yellow color indicates that you are not getting enough water. Thirst is an obvious sign of dehydration and in fact,you need water long before you feel thirsty.
    3 .A good rule of thumb（好的做法）is to take your body weight in pounds and divide that num- her in half. That gives you the number of ounces（盎司）of water per day that you need.For ex-ample,if you weigh 160 pounds,you should drink at least 80 ounces of water per day.If you ex- ercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal amount of water. When you are traveling on an airplane,it is good to have 8 ounces of water for every hour you are on board the plane.
    4 .It may be difficult to drink enough water on a busy day.Be sure you have water handy at all times by keeping a bottle for water with you when you are working,traveling,or exercising. If you get bored with plain water,add a bit of lemon for a touch of flavor. There are some brands of fla-vored water available,but some of them have sugar or artificial sweeteners that you don't need.

    Paragraph 1________
    A: Ounces of water needed per day
    B:.Importance of water
    C: Composition of water
    D: Signs of dehydration
    E: Supply of water
    F: Necessity for bringing a bottle for water

    答案：B
    解析：
    第一段讲到人体约60％～70％是由水组成的；血液大部分都是水，体温的调节，运输滋养物到各个器官，运送氧气到各个细胞，废物排除，人体关节和器官的保护等都离不开水。故本段主要讲的是水对人体的重要性。故选B。


    第二段首句讲到我们通过排尿、呼吸和流汗流失水分。第三句开始主要讲的是脱水的表现。它包括关节与肌肉的慢性疼痛、腰痛、头痛、便秘、口渴等。故选D。


    第三段首句讲的是人体每天所需的饮水量，即一个人每天所需的基本饮水量单位以盎司计，数量是体重磅数的一半。并介绍了在一些特殊情况下所需的饮水量。


    第四段主要讲的是随身携带水瓶及时饮水的必要性。此段首句讲到在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，如果嫌水无味，可以加点柠檬。


    由第一段“Our bodies are estimated to be about 60% to 70% water. Blood is mostly water”可知，人体约60%～ 70％是由水组成的，而且人体自身的新陈代谢和机体的运行都离不开水，因此人离开水是活不下去的，故选B。


    由第二段“Symptoms of mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain, headaches , and constipation（便秘）”可知，人体严重缺水便会产生脱水现象，并伴有关节和肌肉疼痛、背痛等症状。故选A。


    由第三段“A good rule of thumb（好的做法）is to take your body weight in pounds and divide that number in half. That gives you the number of ounces（盎司）of water per day that you need.”可知，我们可以把体重用盎司表示出来，盎司的一半就是我们需要的基本饮水量，因此人体每天所需的饮水量与人的体重有密切关系，故选F。


    由第四段“It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working…”可知，在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，即使再忙也不要忘了喝水，故选E。

  • 第6题：

    共用题干
    The Drink Your Body Needs Most
    1. Our bodies are estimated to be about 60%to 70%water. Blood is mostly water, and our mus- dles,lungs and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients（滋养物）to travel to all our organs. Water also transports oxy-gen to our cells,removes waste,and protects our joints and organs.
    2. We lose water through urination（排尿）, respiration（呼吸）, and by sweating. If you are very active,you lose more water than if you do not take much exercise.Symptoms of mild dehydration （脱水）include chronic pains in joints and muscles,lower back pain,headaches,and constipation
    （便秘）.A strong smell to your urine,along with a yellow color indicates that you are not getting enough water. Thirst is an obvious sign of dehydration and in fact,you need water long before you feel thirsty.
    3 .A good rule of thumb（好的做法）is to take your body weight in pounds and divide that num- her in half. That gives you the number of ounces（盎司）of water per day that you need.For ex-ample,if you weigh 160 pounds,you should drink at least 80 ounces of water per day.If you ex- ercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal amount of water. When you are traveling on an airplane,it is good to have 8 ounces of water for every hour you are on board the plane.
    4 .It may be difficult to drink enough water on a busy day.Be sure you have water handy at all times by keeping a bottle for water with you when you are working,traveling,or exercising. If you get bored with plain water,add a bit of lemon for a touch of flavor. There are some brands of fla-vored water available,but some of them have sugar or artificial sweeteners that you don't need.

    One cannot live________.
    A: in your body
    B: without water
    C: before long
    D: for a change
    E: on a busy day
    F: to your weight

    答案：B
    解析：
    第一段讲到人体约60％～70％是由水组成的；血液大部分都是水，体温的调节，运输滋养物到各个器官，运送氧气到各个细胞，废物排除，人体关节和器官的保护等都离不开水。故本段主要讲的是水对人体的重要性。故选B。


    第二段首句讲到我们通过排尿、呼吸和流汗流失水分。第三句开始主要讲的是脱水的表现。它包括关节与肌肉的慢性疼痛、腰痛、头痛、便秘、口渴等。故选D。


    第三段首句讲的是人体每天所需的饮水量，即一个人每天所需的基本饮水量单位以盎司计，数量是体重磅数的一半。并介绍了在一些特殊情况下所需的饮水量。


    第四段主要讲的是随身携带水瓶及时饮水的必要性。此段首句讲到在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，如果嫌水无味，可以加点柠檬。


    由第一段“Our bodies are estimated to be about 60% to 70% water. Blood is mostly water”可知，人体约60%～ 70％是由水组成的，而且人体自身的新陈代谢和机体的运行都离不开水，因此人离开水是活不下去的，故选B。


    由第二段“Symptoms of mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain, headaches , and constipation（便秘）”可知，人体严重缺水便会产生脱水现象，并伴有关节和肌肉疼痛、背痛等症状。故选A。


    由第三段“A good rule of thumb（好的做法）is to take your body weight in pounds and divide that number in half. That gives you the number of ounces（盎司）of water per day that you need.”可知，我们可以把体重用盎司表示出来，盎司的一半就是我们需要的基本饮水量，因此人体每天所需的饮水量与人的体重有密切关系，故选F。


    由第四段“It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working…”可知，在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，即使再忙也不要忘了喝水，故选E。

  • 第7题：

    单选题
    Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect（）
    A

    overloading in all cylinders

    B

    a jammed three-way thermostatic valve

    C

    chromate PH too low

    D

    a high level in the surge tank


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    Once you have established the daily ration of drinking water in a survival situation，how should you drink it?（）
    A

    Small sips at regular intervals during the day

    B

    The complete daily ration at one time during the day

    C

    One-third the daily ration three times daily

    D

    Small sips only after sunset


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    To clean a dirty fiber towing hawser used in ocean towing，you should（）.
    A

    use lye or other mild detergent

    B

    wash it with fresh water，dry and store it

    C

    wash it with salt water

    D

    use cleaning fluid on nylon，dacron and other synthetic lines


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Before marine sewage treatment plant works （） should be filled with fresh water.
    A

    deposition chamber

    B

    oxidation pool

    C

    disinfection chamber

    D

    all chamber


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    Which statement concerning the collection of fresh water is FALSE?（）
    A

    Fresh water may be obtained from fish

    B

    Lifeboat covers or canopies should be washed with rain before drinking water is collected

    C

    Fresh water may be collected from condensation inside the liferaft

    D

    Seawater should never be consumed


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Prior to getting underway in fresh or brackish water，the Master must（）.
    A

    log the density of the water

    B

    secure all overboard discharges

    C

    take on fresh water ballast

    D

    clean the sides with fresh water


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Before starting a gasoline engine on a motorboat，you should make sure for safety that ______．

    A.The gasoline tank is full

    B.The bilges，cabins，etc．are thoroughly ventilated

    C.You have fresh water on board

    D.Each of the above is followed


    正确答案：B

  • 第14题：

    共用题干
    The Drink Your Body Needs Most

    I Our bodies are estimated to be about 60% to 70% water. Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water. Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine, along with a yellow
    color indicates that you are not getting enough water. Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your bod犷weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20
    minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water. When you are traveling on an airplane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    Paragraph 4__________
    A:Ounces of water needed per day
    B:Importance of water
    C:Composition of water
    D:Signs of dehydration
    E:Supply of water
    F:Necessity for bringing a bottle for water with you

    答案：F
    解析：

  • 第15题：

    共用题干
    The Drink Your Body Needs Most

    I Our bodies are estimated to be about 60% to 70% water. Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water. Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine, along with a yellow
    color indicates that you are not getting enough water. Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your bod犷weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20
    minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water. When you are traveling on an airplane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    One cannot live________
    A:in your body
    B:without water
    C:before long
    D:for a change
    E:on a busy day
    F:to your weight

    答案：B
    解析：

  • 第16题：

    共用题干
    The Drink Your Body Needs Most

    1 Our bodies are estimated to be about 60% to 70% water.Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water.Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles , lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine , along with a yellow
    color indicates that you are not getting enough water.Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your body weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water.When you are traveling on an airpiane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    One cannot live_______.
    A:in your body
    B:without water
    C:before long
    D:for a change
    E:on a busy day
    F:to your weight

    答案：B
    解析：

  • 第17题：

    共用题干
    The Drink Your Body Needs Most

    1 Our bodies are estimated to be about 60% to 70% water.Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water.Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles , lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine , along with a yellow
    color indicates that you are not getting enough water.Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your body weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water.When you are traveling on an airpiane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    Paragraph 3________
    A:Ounces of water needed per day
    B:Importance of water
    C:Composition of water
    D:Signs of dehydration
    E:Supply of water
    F:Necessity for bringing a bottle for water with you

    答案：A
    解析：

  • 第18题：

    单选题
    Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.
    A

    the gasoline tank is full

    B

    the bilges，cabins，etc. are thoroughly ventilated

    C

    you have fresh water on board

    D

    Each of the above is followed


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    If a small electric motor is immersed in salt water it should be （） (1) washed in fresh water (2) dried in an oven
    A

    (1) only

    B

    (2) only

    C

    both (1) and (2)

    D

    neither (1) or (2)


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）
    A

    sea water temperature must never be warmer than 40℃

    B

    jacket water pressure should always be greater than the sea water pressure

    C

    jacket water temperature must always be less than 60℃

    D

    jacket water pressure must always be less than the sea water pressure


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    To repair a small electrical motor that has been submerged in saltwater, you should （）.
    A

    wash it with fresh water and apply an external source of heat

    B

    renew the windings

    C

    send it ashore to an approved service facility

    D

    rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    Allowance for fresh water refers to（）.
    A

    the provision to be provided when the vessel sails in fresh water area

    B

    the fresh water to be carried by a vessel

    C

    the allowance of fresh water for each crew member when in distress at sea

    D

    the amount of free board decreased when sailing in fresh water area


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    Fire hose should be washed with（）.
    A

    salt water and a wire brush

    B

    caustic soap

    C

    mild soap and fresh water

    D

    a holystone


    正确答案： A
    解析： 暂无解析

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