问答题A man jogs at 6 mph over a certain distance and walks back over the same route at 4 mph. What is his average speed for the journey?

题目
问答题
A man jogs at 6 mph over a certain distance and walks back over the same route at 4 mph. What is his average speed for the journey?
相似考题

1.Communication through writing emancipates man from the constraints imposed by the face－to－face distance and the () of time.A、spontaneityB、responsibilityC、complexityD、confusion

2.Communication through writing emancipates man from the constraints imposed by the face-to-face___and the spontaneity of time.A. confusionB. responsibilityC. complexityD. distance

3.Tiny atomic electric batteries have certain advantages over the() storage batteries.A、universalB、indlusiveC、indefiniteD、conventional

4.with them. The first man got over his shock and politely said to 67.

更多“A man jogs at 6 mph over a certain distance and walks back o”相关问题

  • 第1题：

    Do you know the man who’s in a () study under the tree over there?


    正确答案：brown
    解析：本句参考译文：那边树下有个男人在沉思，你认识他吗?

  • 第2题：

    When comparing DSL broadband to cable broadband, which of the following is an advantage ofDSL broadband?()

    A. Upgraded copper lines allow maximum speed greater than cable

    B. Signal is not shared back to the switch

    C. Signal is shared back to the switch

    D. Distance is not a factor in signal speed


    参考答案：B

  • 第3题：

    共用题干
    Spacing in Animals
    1. Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees.“Flight distance”is the terms used for this interspecies spacing. As a general rule,there is a positive relationship between the size of an ani-mal and its flight distance-the larger the animal,the greater the distance it must keep between itself and the enemy.An antelope will flee when the enemy is as much as five hundred yards a-way .The wall lizard's flight distance,on the other hand,is about six feet. Flight is the basic means of survival for mobile creatures.
    2. Critical distance apparently is present wherever and whenever there is a flight reaction.“Criti-cal distance”includes the narrow zone separating flight distance from attack distance.A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome.If the man continues the approach,he soon penetrates the lion's critical distance,at which point the cor-nered lion reverses direction and begins slowly to stalk the man.
    3 .Social animals need to stay in touch with each other. Loss of contact with the group can be fatal for a variety of reasons including exposure to enemies.Social distance is not simply the dis- tance at which an animal will lose contact with his group-that is,the distance at which it can no longer see,hear,or smell the group-it is rather a psychological distance,one at which the animal apparently begins to feel anxious when he exceeds its limits.We can think of it as a hidden band that contains the group.
    4. Social distance varies from species to species.It is quite short-apparently only a few yardsamong some animals,and quite long among others.
    5. Social distance is not always rigidly fixed but is determined in part by the situation.When the young of apes and humans are mobile but not yet under control of the mother's voice,social distance may be the length of her reach.This is readily observed among the baboons in a zoo.When the baby approaches a certain point,the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger,social distance shrinks.To show this in man,one has only to watch a family with a number of small children holding hands as they cross a busy street.

    Paragraph 5______
    A: Philosophical distance
    B: Flight distance
    C: Social distance is determined in part by the situation
    D: Critical distance
    E: Social distance
    F: Physical distance

    答案：C
    解析：
    “‘Flight distance' is the terms used for this interspecies spacing.”“逃离距离”是用来描述物种间的这种间隔距离的术语。


    这一段一开头就提到，危险距离指的是逃离距离和进攻距离之间的狭窄区域。


    这段讲的就是动物间的社会距离的概念及其重要性。


    这一段第一句话就提到“社会距离不是不变的，而是部分取决于环境的。”


    答案可以从第一段找到，最符合原文对flight distance下的定义。


    “…at which point the cornered lion reverses direction and begins slowly to stalk the man.”这时走投无路的狮子调转过头来，开始慢慢地前进，接近人。所以当动物危险距离被入侵时，动物开始攻击。


    根据文章，社会距离指心理距离。原句：…it is rather a psychological distance.


    动物间的社会距离不同。文中原句为：Social distance varies from species to species.

  • 第4题：

    共用题干
    Spacing in Animals
    1. Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees.“Flight distance”is the terms used for this interspecies spacing.As a general rule,there is a positive relationship between the size of an ani-mal and its flight distance-the larger the animal,the greater the distance it must keep between itself and the enemy.An antelope will flee when the enemy is as much as five hundred yards a-way .The wall lizard's flight distance,on the other hand,is about six feet. Flight is the basic means of survival for mobile creatures.
    2. Critical distance apparently is present wherever and whenever there is a flight reaction.“Criti-cal distance”includes the narrow zone separating flight distance from attack distance.A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome.If the man continues the approach,he soon penetrates the lion's critical distance,at which point the cornered lion reverses direction and begins slowly to stalk the man.
    3. Social animals need to stay in touch with each other. Loss of contact with the group can be fa-tal for a variety of reasons including exposure to enemies.Social distance is not simply the dis-tance at which an animal will lose contact with his group-that is,the distance at which it can no longer see,hear,or smell the group-it is rather a psychological distance,one at which the ani- mal apparently begins to feel anxious when he exceeds its limits.We can think of it as a hidden band that contains the group.
    4. Social distance varies from species to species. It is quite short-apparently only a few yards- among some animals,and quite long among others.
    5. Social distance is not always rigidly fixed but is determined in part by the situation.When the young of apes and humans are mobile but not yet under control of the mother's voice,social dis-tance may be the length of her reach .This is readily observed among the baboons in a zoo .When the baby approaches a certain point,the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger,social distance shrinks.To show this in man,one has only to watch a family with a number of small children holding hands as they cross a busy street.

    Paragraph 1______
    A: Philosophical distance
    B: Flight distance
    C: Social distance is determined in part by the situation
    D: Critical distance
    E: Social distance
    F: Physical distance

    答案：B
    解析：
    “‘Flight distance' is the terms used for this interspecies spacing.”“逃离距离”是用来描述物种间的这种间隔距离的术语。


    这一段一开头就提到，危险距离指的是逃离距离和进攻距离之间的狭窄区域。


    这段讲的就是动物间的社会距离的概念及其重要性。


    这一段第一句话就提到“社会距离不是不变的，而是部分取决于环境的。”


    答案可以从第一段找到，最符合原文对flight distance下的定义。


    “...at which point the cornered lion reverses direction and begins slowly to stalk the man.”这时走投无路的狮子调转过头来，开始慢慢地前进，接近人。所以当动物危险距离被入侵时，动物开始攻击。


    根据文章，社会距离指心理距离。原句：… it is rather a psychological distance.


    动物间的社会距离不同。文中原句为：Social distance varies from species to species.

  • 第5题：

    “登船人员”可翻译成：MAN OVER BOARD。


    正确答案:错误

  • 第6题：

    When comparing DSL broadband to cable broadband, which of the following is an advantage ofDSL broadband?（）

    • A、Upgraded copper lines allow maximum speed greater than cable
    • B、Signal is not shared back to the switch
    • C、Signal is shared back to the switch
    • D、Distance is not a factor in signal speed

    正确答案:B

  • 第7题：

    单选题
    Besides saving distance along the track line，another advantage of the Scharnow Turn over the Williamson Turn in a man overboard situation because（）.
    A

    it is faster

    B

    it can be used in both the immediate action and the delayed action situations

    C

    in fog，if the turn is started as soon as the man goes over，the vessel will be at the point where he went over when the turn is completed

    D

    it returns the vessel to the original track line on a reciprocal course


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    To increase the distance to the vessel ahead by reducing one’s own speed means（）.
    A

    fall back

    B

    keep low speed

    C

    running after

    D

    drop back


    正确答案： B
    解析： 暂无解析

  • 第9题：

    问答题
    A man jogs at 6 mph over a certain distance and walks back over the same route at 4 mph. What is his average speed for the journey?

    正确答案： 4.8 mph
    解析：
    mph英里/小时。设单程距离为x，平均速度=总距离/总时间=2x/(x/6+x/4)=4.8

  • 第10题：

    单选题
    The young lady coming over to us（）our English teacher; the way she walks tells us that!
    A

    must be

    B

    can be

    C

    would be

    D

    could be


    正确答案： A
    解析： 暂无解析

  • 第11题：

    多选题
    A certain highway has Exits l, 2, 3, and 4 in that order. Which of the following statements individually provide (s) sufficient additional information to determine the distance from Exit 2 to Exit 3? (Select all such statements.)
    A

    The distance from Exit l to Exit 3 is 7 miles, and the distance from Exit 3 to Exit 4 is 4 miles.

    B

    The total distance from Exit 1 to Exit 4 is 23 miles, the distance from Exit 1 to Exit 2 is 3 miles, and the distance from Exit 3 to Exit 4 is 9 miles.

    C

    The total distance from Exit l to Exit 4 is 23 miles, and the distance from Exit 2 to Exit 4 is 20 miles.


    正确答案： B,C
    解析：
    解答这道题需要知道全部4个出口间的距离，因此，分析可知，选项A、C均不符合题意，只有B项能够计算出二号出口和三号出口间的距离，因此，选择B项。

  • 第12题：

    单选题
    Charted depth is the（）.
    A

    vertical distance from the tidal datum to the ocean bottom plus the height of the tide

    B

    vertical distance from the tidal datum to the ocean bottom

    C

    average height of water over a specified period of time

    D

    average height of all low waters at a place


    正确答案： D
    解析： 暂无解析

  • 第13题：

    [A] handed out

    [B] turn over

    [C] brought back

    [D] passed down


    正确答案：A

  • 第14题：

    共用题干
    Spacing in Animals
    1. Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees.“Flight distance”is the terms used for this interspecies spacing. As a general rule,there is a positive relationship between the size of an ani-mal and its flight distance-the larger the animal,the greater the distance it must keep between itself and the enemy.An antelope will flee when the enemy is as much as five hundred yards a-way .The wall lizard's flight distance,on the other hand,is about six feet. Flight is the basic means of survival for mobile creatures.
    2. Critical distance apparently is present wherever and whenever there is a flight reaction.“Criti-cal distance”includes the narrow zone separating flight distance from attack distance.A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome.If the man continues the approach,he soon penetrates the lion's critical distance,at which point the cor-nered lion reverses direction and begins slowly to stalk the man.
    3 .Social animals need to stay in touch with each other. Loss of contact with the group can be fatal for a variety of reasons including exposure to enemies.Social distance is not simply the dis- tance at which an animal will lose contact with his group-that is,the distance at which it can no longer see,hear,or smell the group-it is rather a psychological distance,one at which the animal apparently begins to feel anxious when he exceeds its limits.We can think of it as a hidden band that contains the group.
    4. Social distance varies from species to species.It is quite short-apparently only a few yardsamong some animals,and quite long among others.
    5. Social distance is not always rigidly fixed but is determined in part by the situation.When the young of apes and humans are mobile but not yet under control of the mother's voice,social distance may be the length of her reach.This is readily observed among the baboons in a zoo.When the baby approaches a certain point,the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger,social distance shrinks.To show this in man,one has only to watch a family with a number of small children holding hands as they cross a busy street.

    If an animal's critical distance is penetrated,it will______.
    A: differs among animal species
    B: to psychological distance
    C: begin to attack
    D: to physiological distance
    E: distance between an animal and its enemy before fleeing
    F: distance between certain animal species before fleeing

    答案：C
    解析：
    “‘Flight distance' is the terms used for this interspecies spacing.”“逃离距离”是用来描述物种间的这种间隔距离的术语。


    这一段一开头就提到，危险距离指的是逃离距离和进攻距离之间的狭窄区域。


    这段讲的就是动物间的社会距离的概念及其重要性。


    这一段第一句话就提到“社会距离不是不变的，而是部分取决于环境的。”


    答案可以从第一段找到，最符合原文对flight distance下的定义。


    “…at which point the cornered lion reverses direction and begins slowly to stalk the man.”这时走投无路的狮子调转过头来，开始慢慢地前进，接近人。所以当动物危险距离被入侵时，动物开始攻击。


    根据文章，社会距离指心理距离。原句：…it is rather a psychological distance.


    动物间的社会距离不同。文中原句为：Social distance varies from species to species.

  • 第15题：

    共用题干
    Spacing in Animals
    1. Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees.“Flight distance”is the terms used for this interspecies spacing.As a general rule,there is a positive relationship between the size of an ani-mal and its flight distance-the larger the animal,the greater the distance it must keep between itself and the enemy.An antelope will flee when the enemy is as much as five hundred yards a-way .The wall lizard's flight distance,on the other hand,is about six feet. Flight is the basic means of survival for mobile creatures.
    2. Critical distance apparently is present wherever and whenever there is a flight reaction.“Criti-cal distance”includes the narrow zone separating flight distance from attack distance.A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome.If the man continues the approach,he soon penetrates the lion's critical distance,at which point the cornered lion reverses direction and begins slowly to stalk the man.
    3. Social animals need to stay in touch with each other. Loss of contact with the group can be fa-tal for a variety of reasons including exposure to enemies.Social distance is not simply the dis-tance at which an animal will lose contact with his group-that is,the distance at which it can no longer see,hear,or smell the group-it is rather a psychological distance,one at which the ani- mal apparently begins to feel anxious when he exceeds its limits.We can think of it as a hidden band that contains the group.
    4. Social distance varies from species to species. It is quite short-apparently only a few yards- among some animals,and quite long among others.
    5. Social distance is not always rigidly fixed but is determined in part by the situation.When the young of apes and humans are mobile but not yet under control of the mother's voice,social dis-tance may be the length of her reach .This is readily observed among the baboons in a zoo .When the baby approaches a certain point,the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger,social distance shrinks.To show this in man,one has only to watch a family with a number of small children holding hands as they cross a busy street.

    The most appropriate definition of Flight Distance is______.
    A: differs among animal species
    B: to psychological distance
    C: begin to attack
    D: to physiological distance
    E: distance between an animal and its enemy before fleeing
    F: distance between certain animal species before fleeing

    答案：E
    解析：
    “‘Flight distance' is the terms used for this interspecies spacing.”“逃离距离”是用来描述物种间的这种间隔距离的术语。


    这一段一开头就提到，危险距离指的是逃离距离和进攻距离之间的狭窄区域。


    这段讲的就是动物间的社会距离的概念及其重要性。


    这一段第一句话就提到“社会距离不是不变的，而是部分取决于环境的。”


    答案可以从第一段找到，最符合原文对flight distance下的定义。


    “...at which point the cornered lion reverses direction and begins slowly to stalk the man.”这时走投无路的狮子调转过头来，开始慢慢地前进，接近人。所以当动物危险距离被入侵时，动物开始攻击。


    根据文章，社会距离指心理距离。原句：… it is rather a psychological distance.


    动物间的社会距离不同。文中原句为：Social distance varies from species to species.

  • 第16题：

    Who is that man over there? Do you know（）name?

    • A、his
    • B、he’s
    • C、he

    正确答案:A

  • 第17题：

    Which statement is true about vishing？（）

    • A、Influencing users to forward a call to a toll number （for example， a long distance or international number）
    • B、Influencing users to provide personal information over a web page
    • C、Using an inside facilitator to intentionally forward a call to a toll number （for example， a long distance orinternational number）
    • D、Influencing users to provide personal information over the phone

    正确答案:D

  • 第18题：

    如果汽车自30MPH增至90MPH，则制动时所产生之热量增至（）倍

    • A、2倍
    • B、3倍
    • C、6倍
    • D、9倍

    正确答案:D

  • 第19题：

    单选题
    _______ no cause for alarm, the old man went back to his bedroom.
    A

    There was    

    B

    Since 

    C

    Being  

    D

    There being


    正确答案： B
    解析：
    由于没有恐慌, 那位老人又回到卧室去了。本题考查非谓语动词及其独立主格结构。根绝句意可判断，前后内容为因果关系，A项there was填在空格处，需要用连词连接前后两个句子，故应排除。since表示“由于”时，后应加句子，being 不符合句子语法结构。故正确答案为D项，there being为独立主格结构，在本句中表示原因。

  • 第20题：

    单选题
    On his back the man carried a heavy（）of old clothes.
    A

    bulk

    B

    bundle

    C

    stock

    D

    mass


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind （）.
    A

    comes over the bow

    B

    blows the fire back toward the vessel

    C

    comes over the stern

    D

    comes over either beam


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    The man moved _____ forward and looked over the edge, shrinking his shoulders.
    A

    accurately

    B

    cautiously

    C

    brilliantly

    D

    disappointedly


    正确答案： A
    解析：
    句意：这个人小心地向前移动并且看看四周，缩了缩肩膀。accurately精确地，cautiously小心地，brilliantly聪明地，disappointedly失望地。

  • 第23题：

    单选题
    When she put on her hat, she ______ the man as he climbed back on his bike.
    A

    saved

    B

    passed

    C

    studied

    D

    chose


    正确答案： C
    解析：
    联系上下文可知是当男人骑车从她身边经过的时候……，故答案选B，意为“经过；路过”。

  • 第24题：

    单选题
    Charted depth is the （）.
    A

    vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide

    B

    vertical distance from the chart sounding datum to the ocean bottom

    C

    average height of water over a specified period of time

    D

    average height of all low waters at a place


    正确答案： A
    解析： 暂无解析

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