D. very excited.

　　48. Which is a reason for the last few years’ Chinese investors feeling glad?

　　A. poor access to transport that will be the first to go.

　　B. investors in China's black gold got much money.

　　C. spot prices will be set by bigger producers.

　　D. coal price rose 81%.

　　49. What caused a cyclical slowdown of coal price?

　　A. strong growth in profitability.

　　B. China's money tightening and slowing construction.

　　C. China's 60 biggest miners.

　　D. the small are disappearing.

　　50. What may the word convey mean in the fifth paragraph?

　　A. transport.

　　B. change.

　　C. reduce.

　　D. increase.

　　D

　　Ozone depletion（臭氧消耗）, greenhouse effect, and acid rain are man-made disasters. The ozone layer is the part of the Earth's atmosphere which contains relatively high concentrations of ozone (O3). The cause of ozone depletion is the presence of Chlorofluorocarbons (CFCs) and related halocarbons gases in the atmosphere. In the presence of Ultraviolet light, these gases removed, releasing chlorine atoms, which then go on to catalyze ozone destruction. The greenhouse effect, on the other hand, is a natural warming process of the earth. When the sun's energy reaches the earth some of it is reflected back to space and the rest is absorbed. The absorbed energy warms the earth's surface which then emits heat energy back toward space as longwave radiation. This outgoing longwave radiation is partially trapped by greenhouse gases, such as carbon dioxide (CO2), which then radiate the energy in all directions, warming the earth's surface and atmosphere.

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