B.ugly
C.special
D.silly
30.A.have
B.get
C.take
D.miss
Ⅲ.阅读理解A
A rising population is one of the main reasons of global warming. From 1930 to the end of the century the population rose from two billion to over six billion. It is expected that this trend in the changing population will continue. The growing population requires increasing amounts of energy. These energy demands and other supplies require production, which almost always involves the release of greenhouse gases. The more the population increases, the more greenhouse gases are produced and the greater increase in temperature.
The burning of fossil fuels is one of the causes for global warming. When fossil fuels burn, they release large amounts of carbon dioxide. The carbon dioxide in the car then leads to global warming.
Another source of carbon dioxide comes from cutting trees. In forests there is enormous amount of carbon that is stored in the trees and other plants. This carbon is out of the atmosphere because the trees consume the carbon from carbon dioxide. When these trees are cut down, they are frequently burned.This burning releases the carbon dioxide into the atmosphere. Even when new trees are planted, it can take up to one hundred years to supply the carbon that was released.It is commonly thought that because young trees absorb more carbon dioxide, the atmosphere experiences positive effects.
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