If headaches only occur at night,lack of fresh air is often the cause.A:start B:begin C:happen D:visit

题目
If headaches only occur at night,lack of fresh air is often the cause.

A:start
B:begin
C:happen
D:visit
相似考题

1.Gypsies are often treated with disapproval, lack of trust, and lack of understanding because their way of life is so different from the way most other British people live.

2.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

3.My friend often works ( ) night,A、inB、forC、duringD、at.

4.Health depends ______good food, fresh air and enough sleep.A. fromB. upC. onD. over

更多“If headaches only occur at night,lack of fresh air is often the cause.”相关问题

  • 第1题：

    Air pollution

    People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics(统计资料) show that 93 percent of all auto trips are within cities.

    Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the county.

    On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes(烟)from iron, steel, chemical, and petrol production add particles(微粒)to the air.

    The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode(腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.

    26. The key point of the passage is that().

    A. the cause of air pollution is people

    B. the causes and the effects of air pollution are both found in cities

    C. the effects of air pollution range from headaches to death

    27. What is the purpose of this passage?

    A. to persuade people to stop polluting the air().

    B. to tell the causes of air pollution

    C. to tell why cities are bad places to live

    28. Why is air pollution more grave in the city than in the country?().

    A. Because there are larger populations in cities.

    B. Because the air in the city is dirty.

    C. Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.

    29. The fumes from coal and oil may cause metal().

    A. to corrode

    B. to twist

    C. to turn black

    30. In larger cities, the fumes from coal and oil may contribute to().

    A. heart disease

    B. loss of clear vision

    C. lung diseases


    参考答案：26、A 27、B 28、A 29、A 30、C


  • 第2题：

    Heating，ventilating，and air conditioning（HVAC） systems are______in most of underground subway stations to provide comfortable and fresh air to underground subway stations。

    A.assembled
    B.installing
    C.equipped
    D.installed

    答案：D
    解析：
    本题考查动词的词义辨析。题目意为“大多数地下地铁车站都安装了供暖、通风和空调系统，为地下地铁车站提供舒适和新鲜的空气。”A选项“装配，集合”，B选项“安装”，C选项“装备”， D选项“（被）安装”。由于主语是物，和动词“安装”之间构成被动关系，因此要选择“（被）安装”。
    　　

  • 第3题：

    Please （） the window to let some fresh air in. 【open】　　请打开窗户通通气。


    正确答案:open

  • 第4题：

    We should take （）to keep the chemicals away from fire.

    • A、great care
    • B、some measures
    • C、fresh water
    • D、fresh air

    正确答案:B

  • 第5题：

    单选题
    A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）
    A

    low lube oil temperature

    B

    low starting air temperature

    C

    air in the fuel injection

    D

    water in the starting air system


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    （） is the removal of exhaust gases by blowing in fresh air.
    A

    Gas exchange

    B

    Charging

    C

    Scavenging

    D

    Supercharging


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.
    A

    to need

    B

    ready for

    C

    want to

    D

    going to be


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    The term diesel engine scavenging means（）
    A

    delivering more air into the cylinder than it would normally receive during an ordinary charging process

    B

    forcing the products of combustion out of the cylinder with the fresh air charge

    C

    collecting the air charge at the cleaner

    D

    combustion and expansion of hot gas


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）
    A

    the supply of normal air and removal of compressed air

    B

    the supply of fuel oil and combustion of the atomized oil

    C

    the supply of fresh air and removal of exhaust gases

    D

    the supply of fresh air and removal of the extra heat


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    What is the passage mainly about?
    A

    How to fight air pollution in big cities.

    B

    How to avoid air pollution in big cities.

    C

    How to breathe fresh air in big cities.

    D

    How serious air pollution is in big cities.


    正确答案： B
    解析：
    第一段第四句是全文的主题句：城市人如何减少接触被污染的空气。

  • 第11题：

    单选题
    Steam smoke will occur when（）.
    A

    extremely cold air from shore passes over warmer water

    B

    warm dry air from shore passes over cooler water

    C

    cold ocean water evaporates into warm air

    D

    cool rain passes through a warm air mass


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.
    A

    camshaft；fresh air

    B

    camshaft；starting air

    C

    electronic motor which is controlled by a computer；fresh air

    D

    electronic motor which is controlled by a computer；starting air


    正确答案： D
    解析： 暂无解析

  • 第13题：

    _______there is fresh air, there is oxygen.

    A．Wherever
    B．Whenever
    C．Unless
    D．Whether

    答案：A
    解析：
    考查地点状语从句。句意为“凡是有空气的地方，就有氧气”。这里wherever表示无论哪里的意思，其他选项都不符合逻辑。

  • 第14题：

    If headaches only occur at night,lack of fresh air is often the cause.

    A:start
    B:begin
    C:happen
    D:visit

    答案：C
    解析：

  • 第15题：

    The （）(天窗) admits light and fresh air through.

    • A、skylight
    • B、bulwark
    • C、keel
    • D、bulkhead

    正确答案:A

  • 第16题：

    单选题
    The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.
    A

    the cylinder head

    B

    the cross-head

    C

    the moving piston

    D

    the stationary piston


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    A class "B" fire would most likely occur in the （）.
    A

    main switchboard

    B

    engine room bilge

    C

    breathing compartment

    D

    electric fresh water transfer pump


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    What is the use of “aroma box” at Heathrow airport?
    A

    It can scent a lot of synthetic fragrance into the environment.

    B

    It is a machine which blows warm and fresh air into the environment.

    C

    It often pumps the smell of freshly-cut grass from a high-street shop.

    D

    It is a box which sends out not only aroma but also music.


    正确答案： B
    解析：
    细节理解题。答案出处为原文第一段。第一段提到a machine which blows warm scented air into the environment，在四个选项中，只有A提到了fragrance，与原文的scented对应。B项中的fresh及D项中的music在第一段中没有提到。C项虽是文中的内容，但不够全面。

  • 第19题：

    单选题
    Sweat damage will occur in a cargo hold containing machinery parts when（）.
    A

    the outside air is colder than the cargo

    B

    the air temperature of the hold is higher than the outside air temperature

    C

    the dew point of the hold is higher than the temperature of the cargo

    D

    the dew point of the outside air is lower than the temperature of the cargo


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    Scavenging is （） of exhaust gases by blowing in fresh air.
    A

    the suction

    B

    the compression

    C

    the removal

    D

    the deliver


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
    A

    catch plates

    B

    dampers

    C

    regulating valves

    D

    fans


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    As for a diesel engine, lack of combustion air may be due to （）.
    A

    fouling turbine

    B

    fuel pump faults

    C

    lubrication failure

    D

    excessive cooling


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）
    A

    admit only enough fresh outside air to provide proper ventilation

    B

    reduce the air reheating system load

    C

    lower the compressor head pressure

    D

    operate the purge recovery unit continuously


    正确答案： C
    解析： 暂无解析

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