单选题A To transport water to high places.B To provide air conditioning.C To fertilize the soil.D To adjust the soil temperature.

题目
单选题
A

To transport water to high places.

B

To provide air conditioning.

C

To fertilize the soil.

D

To adjust the soil temperature.

相似考题

1.Fusible plugs are installed in fire-tube boilers to _____.A.provide a means of draining the boilerB.warn the engineer of low water levelC.cool the crown sheet at high firing ratesD.open the burners electrical firing circuits

2.One function provided by a hydraulic accumulator is to ___.A.provide an area where air can separate from the oilB.provide an area to separate solid contaminants from the oilC.act as an oil and water separatorD.absorb shocks occurring in the system

3.DHave you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the riverbank or from t}le nearby fields.Components of SoilSoil is made up of a number of layers（层），each having its own distinctive colour and texture. The upper layer is known as the litter. It acts like a blanket. limiting temperature changes and reducing water loss. The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus（腐殖质），which is black and gives the topsoil its dark colour. This layer is usually rich in nutrients，oxygen，and water. Below the topsoil is the subsoil，a layer that contains more stones mixed with only small amounts of organic matter. This layer is lighter in colour because of the lack of humus. Beneath the soil lies a layer of bedrock.Soil forms from the bottom up. Over time bedrock is attacked by rain, wind，frost, and snow. It is gradually broken down into smaller particles in a process called weathering. Plants begin to grow，and rotten materials enrich the topsoil. Most of the soil in Eastern Canada. for example. Was formed from weathered rock that was exposed when the ice disappeared l2,000 years ago.Water Beneath the SoilSurface water collects and flows above the ground in lakes. ponds. and rivers. Once in the soil or rock，it is called groundwater. Gravity pulls groundwater through the soil in a process called percolation（渗透）. Eventually the water reaches a layer called the water table. Under this is bedrock through which water cannot percolate.As water percolates downward，it dissolves organic matter and minerals from the soil and carries them to deeper layers. This causes a serious problem because plants require these nutrients for growth.Soil pHSoil can be acidic. neutral. or basic. The pH of the soil is determined by the nature of the rockfrom which it was formed. and by the nature of the plants that grow and rot in it.The acidity of rain and snow can lower the pH of the groundwater that enters the soil. By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils. When fossil fuels are burned. gases are released into the air and then fall back to earth as acid rain. Acid soil increases出e problem of carrying nutrients to lower soil levels. As nutrients are removed，soil is less fertile. Plants grow more slowly in acidic soil，and also become easily attacked by diseases.67. The layer of soil that provides necessary nutrients for plant growth is called.A. 1itter B. topsoil C. humus D. subsoil

4.In Leon Nacson’s view, air and water are our Number One priorities for the following reasons except ().A、he cannot understand why people are polluting air and waterB、there will definitely be no fresh air and clean water for future generationsC、we would run out of air and water if we didn’t stop polluting themD、air and water polluting are the current and futu

参考答案和解析
正确答案： D
解析：
[考点]推断题。录音指出，他们把管子插进土壤中，这样冷水就会降低土壤温度，选项D与此句同义替换。
更多“单选题A To transport water to high places.B To provide air conditioning.C To fertilize the soil.D To adjust the soil temperature.”相关问题

  • 第1题：

    High diesel engine cooling water temperatures can be caused by ______.

    A.air in the cooling system

    B.an overhauled water pump

    C.correct amount of coolant

    D.no air in the cooling system


    正确答案：A

  • 第2题：

    共用题干
    Water

    Earth is like a big blue marble.From high above the Earth and from the moon,the planet gleams and shines.The blue water in the oceans and seas of the Earth makes a dramatic image.The white clouds above the Earth add beauty to the picture.Water is the source of this beauty and the source of life on Earth.It is the reason people can live on this planet. Water is everywhere.(46)_______.It is in the soil,the ground that grows the food.Water is in rock deep under the ground, in natural holding areas一in storage.In a real sense,water keeps Earth alive.
    Nature has an unchanging amount of water. Nature has a perfect system for recycling water. (47)_____.It falls as rain.Then it goes to one of three places.It might sink slowly through the soil into the natural holding areas in the rock.(48)_______一by becoming vapor,or gas.It might run off into streams,rivers and oceans.By itself,nature can keep the balance and provide plenty of clean water for us.Nature recycles water.
    However,people cause problems for this natural recycling system.Nature's recycling system can work well(49)________.Some ways that people upset nature are easy to understand.For example, dirty sewage（污水沟系统）water from homes and factories must not mix with drinking water. People get sick from drinking contaminated water. Sometimes water from factories goes into streams and rivers.It enters into the groundwater. It can flow into lakes too.This kind of contamination from industry(waste water from factories) can be dangerous for people.If water contains poisons and chemicals,it is poison.(50)________;some poisons kill people as well as birds and animals.Without knowing,people can upset nature's recycling system.
    Lakes and rivers add beauty to the world. People enjoy water for entertainment purposes,too. People enjoy swimming and playing in the cool water of a lake in the summer. They like to ride on boats on rivers.Many people enjoy catching fish in the rivers.They fish for food and for sport.However,in some places,the water of the lakes and rivers is no longer safe.These rivers and lakes are contaminated.The fish are dying because of the chemicals from farms and factories.People cannot swim in the polluted water.

    _________（49）
    A:Poison makes people sick
    B:It is in the air that people breathe
    C:We can not live without water
    D:Water is used again and again
    E:only if people work with the system and not against it
    F: It might disappear into the air quickly

    答案：E
    解析：
    文章前一句说水到处都存在，那么后一句应该跟此句有关系，而且下一句说“它存在土壤里”，因此选项B项“它在人们呼吸的空气里”是最合适的。
    文章前一句说大自然有一个循环水的完美系统，那么后一句相关的选项只有D项“水可以一遍又一遍地反复利用”。
    从本句的前后句看这是一个排比句式，三句话都是以it might开头，而后半句“变成蒸汽或水汽”更证明选项F是最合适的。
    本句前一句讲人们会引起大自然循环体系的问题，那么空格里应该填入人们怎么做大自然的循环体系才能很好地运转。因此选项E“只有顺着这个系统，而不是对它造成破坏”是最佳选择。
    本句前后句的关键词是“poison"，因此判断只有选项A“毒物使人生病” 最合适。

  • 第3题：

    The modes of transportation include（）。

    • A、rail and road transport
    • B、water transport
    • C、pipelines
    • D、air transport

    正确答案:A,B,D

  • 第4题：

    单选题
    A marine diesel engine is started by（）
    A

    supplying high pressure oil into a hydraulic motor

    B

    supplying high temperature air into the cylinder

    C

    supplying high pressure air into the cylinder

    D

    electrical igniting


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    The height of tide is the （）.
    A

    depth of water at a specific time due to tidal effect

    B

    difference between the depth of the water and the area's tidal datum

    C

    difference between the depth of the water and the high water tidal level

    D

    difference between the depth of the water at high tide and the depth of the water at low tide


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    In the geography class, the teacher explained wind and water might cause soil（）
    A

    pollution

    B

    excellence

    C

    explosion

    D

    erosion


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
    A

    raw water pump discharge

    B

    expansion tank outlet

    C

    cooling water heat exchanger

    D

    outlet engine jacket water outlet


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    The soundings on the chart are based on the depth of water available at （）.
    A

    mean low water

    B

    mean lower low water

    C

    mean high water

    D

    mean high water springs


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    The air spaces in the floor of an inflatable liferaft will provide protection against（）.
    A

    asphyxiation from CO2

    B

    loss of air in the sides of the raft

    C

    rough seas

    D

    cold water temperatures


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    The speed of an ocean current is dependent on（）.
    A

    the density of the water

    B

    the air temperature

    C

    the presence of a high pressure area near it

    D

    underwater soil conditions


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    While working in the server room a technician notices that water is forming on the walls of the serverroom. Which of the following is the BEST course of action to correct the problem？（）
    A

     Contact facilities staff to adjust the humidity levels.

    B

     Leave the temperature the same， after time it will evaporate on its own.

    C

     Lower the temperature， the cold air will help the water evaporate.

    D

     Contact facilities staff to raise the temperature of the room.


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Your vessel is equipped with totally enclosed lifeboats. Which statement is TRUE when the boat is enveloped in flames?（）.
    A

    The ventilators will automatically close by the action of fusible links

    B

    The motor takes its air supply from outside the lifeboat to prevent asphyxiation of the crew

    C

    A water spray system to cool the outside of the boat is operated by a high-volume manual pump

    D

    An air tank will provide about ten minutes of air for the survivors and the engine


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Conditions for crossing a rough bar are usually best at ______.

    A.low water slack

    B.high water slack

    C.high water ebb

    D.high water flood


    正确答案：B

  • 第14题：

    What kind of products do the air carriers deliver? （）

    • A、The high value     
    • B、Low density or weight
    • C、A and B           
    • D、Shortest time to transport

    正确答案:C

  • 第15题：

    While working in the server room a technician notices that water is forming on the walls of the serverroom. Which of the following is the BEST course of action to correct the problem？（）

    • A、 Contact facilities staff to adjust the humidity levels.
    • B、 Leave the temperature the same， after time it will evaporate on its own.
    • C、 Lower the temperature， the cold air will help the water evaporate.
    • D、 Contact facilities staff to raise the temperature of the room.

    正确答案:A

  • 第16题：

    单选题
    Black smoke coming from a boiler can be caused by （）.
    A

    low water level

    B

    low oil pressure

    C

    excessively high fuel pressure

    D

    an improper air/fuel ratio


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    what kind of products do the air carriers deliver? （）
    A

    The high value

    B

    Low density or weight

    C

    A and B

    D

    Shortest time to transport


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    （） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.
    A

    The fuel oil

    B

    The lube oil

    C

    The sea water

    D

    The fresh water


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    Low cylinder compression pressure and a high exhaust temperature may indicate （）
    A

    early fuel injection timing

    B

    leaking valves

    C

    a continuously open scavenge air port

    D

    low cooling water temperature


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    The word “pollute” means “______”.
    A

    to tell something to a lot of people

    B

    wanting to know about something

    C

    a programme on the radio or on TV

    D

    to make air, water, soil, etc dirty


    正确答案： B
    解析：
    细节理解题。根据pollute的第一条解释“to make air, water, soil etc dangerously dirty”可知D选项正确。

  • 第21题：

    单选题
    High diesel engine cooling water temperatures can be caused by （）.
    A

    air in the cooling system

    B

    an overhauled water pump

    C

    correct amount of coolant

    D

    no air in the cooling system


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）
    A

    Excessive piston blow-by to the manifold

    B

    Insufficient cooling water flow

    C

    Accumulated water in the air boxes

    D

    Clogged air intake filters


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    The purpose of an air compressor unloading device is to （）
    A

    drain water from the air receiver

    B

    drain water from the cylinders

    C

    delay the compression process until the motor is up to speed

    D

    check pump alignment


    正确答案： C
    解析： 暂无解析

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