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Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphere for example, in the relative proportions of atmosphere gases the climate would probably change also. A slight increase in water vapor, for instance, would increase the hem-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase, in water vapor would increase the thickness and extent of the cloud layer, reducing the mount of solar energy reaching the Earth’ surface.
level of carbon dioxide, CO₂, in the atmosphere has important effect on climatic change. Most of the Earth’ s incoming energy is short-wavelength radiation, which tends to pass through atmospheric CO₂ easily. The Earth, however, reradiates much of the received energy as a long-wavelength radiation, which CO₂
A. Why are projections of the effects of changes in water vapor levels on the climate so inaccurate
B. What are the steps in the process that takes place as CO₂ absorbs long-wavelength radiation
C. How might our understanding of the greenhouse effect be improved if the burning of fossil fuels were decreased
D. What might cause a series of regular increases and decreases in the amount of CO₂ in the atmosphere

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Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphere for example, in the relative proportions of atmosphere gases the climate would probably change also. A slight increase in water vapor, for instance, would increase the hem-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase, in water vapor would increase the thickness and extent of the cloud layer, reducing the mount of solar energy reaching the Earth’ surface.
level of carbon dioxide, CO₂, in the atmosphere has important effect on climatic change. Most of the Earth’ s incoming energy is short-wavelength radiation, which tends to pass through atmospheric CO₂ easily. The Earth, however, reradiates much of the received energy as a long-wavelength radiation, which CO₂
A. explaining the effects that the burning of fossil fuels might have on climate
B. illustrating the effects of CO₂ on atmospheric radiation
C. discussing effects that changes in the CO₂ level in the atmosphere might have on climate.
D. challenging hypotheses about the effects of water vapor and CO₂ on climate

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[单项选择]Evidence of past climatic changes indicates that______.

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[单项选择]We consider _____ the machine should be adjusted each time it is used .
A. that it necessary
B. necessary it that
C. it that necessary
D. it necessary that

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[单项选择]We consider ______ the instrument be adjusted each time it is used.
A. that it necessary
B. it necessary that
C. necessary that
D. necessary of it that

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[单项选择]Conditions everywhere have been seriously worsened, ______ the postwar rise in prices.

A. as to
B. in relation to
C. owing to
D. with regard to

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[单项选择]Under what conditions should the bypass operation be performed

A. When a general practitioner is available to perform it.
B. When there is room in the hospital emergency ward for the patient.
C. When the patient can be expected to show favorable results.
D. When the doctor recommends against it.

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[单项选择]Drought conditions in the following countries except ________ are tile worst in decades, slowing agricultural output.

A. Syria
B. Israel
C. Jordan
D. Palestine

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[单项选择]The observation of weather conditions by satellites is advantageous because it ______.

A. enables man to alter the weather
B. makes weather prediction easier
C. gives the scientific information not obtained readily otherwise
D. uses electronic instruments

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[单项选择]Some medical conditions can often cure themselves （） , without medical intervention.
A. deliberately
B. spontaneously
C. consciously
D. intentionally

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