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The current concentration of carbon dioxide in the atmosphere is about 360 p
The current concentration of carbon dioxide in the atmosphere is about 360 p
游客
2024-01-03
33
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问题
The current concentration of carbon dioxide in the atmosphere is about 360 parts per million.
Human activities are having a major influence on atmospheric carbon dioxide concentrations, which are rising so fast that current predictions are that atmospheric concentrations of carbon dioxide will double in the next 50 to 100 years.
The Intergovernmental Panel on Climate Change(IPCC)report in 1992, which represents a
consensus
of most atmospheric scientists, predicts that a doubling of carbon dioxide concentration would raise global temperatures anywhere between 1.4°C and 4.5°C. The IPCC report issued in 2001 raised the temperature prediction almost twofold. The suggested rise in temperature is greater than the changes that occurred in the past between ice ages. The increase in temperatures would not be uniform, with the smallest changes at the equator and changes two or three times as great at the poles. The local effects of these global changes are difficult to predict, but it is generally agreed that they may include alterations in ocean currents, increased winter flooding in some areas of the Northern Hemisphere, a higher incidence of summer drought in some areas, and rising sea levels, which may flood low-lying countries. [br] Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 2? Incorrect choices change the meaning in important ways or leave out essential information.
选项
A、The rapid rise of carbon dioxide concentrations can be attributed largely to the actions of humans.
B、Predictions about atmospheric concentrations of carbon dioxide indicate that the influence of human activities will double soon.
C、In the next 50 to 100 years, human activities will no longer have an influence on atmospheric carbon dioxide concentrations.
D、Human activities can influence current predictions about atmospheric conditions.
答案
A
解析
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