[听力原文]11-15
Most British families live in houses. Perhaps you think this is not surprising. After all, where else can people live In fact, in some countries most people live in flats or in apartments. So do some people in Britain, of course. But in Britain towns, it’s more usual to find rows of houses rather than blocks of flats. A typical British house has a garden at the front and the back. And that is the impress/on you get if you look at the advertisements in magazines and on TV.
Most British families are usually quite small. An average family consists of a mother, a father and two point four children. It is quite rare in Britain for grandparents, or aunts and uncles to share the house with the family. However, families often share the house with dogs and cats which they keep not to eat but as companions.
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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