And studying it is not easy because the effects aren't well understood. For example, nitrogen can be a fertilizer (肥料), but it can stop plant growing when nitrogen comes out of the air in acid form.

　　Right now it seems like we're much more likely to clean up aerosol pollution, while increasing the amount of carbon dioxide in the air. So scientists, unfortunately, may have a chance to see whether this experiment on our planet should continue or not.

　　36. From Paragraph 2, we know that

　　.

　　A. scientists have been aware of how aerosols work

　　B. Natalie Mahowald is an expert in climate

　　C. cleaning up the air is so popular

　　D. pollutants are under control so far

　　【答案】B

　　【解析】细节理解题。由第二段第二句Natalie Mahowald的同位语a climate researcher at Cornell University可知Natalie MahowaldB。

　　37. What is Natalie Mahowald's opinion on those aerosols?

　　A. Aerosols can influence each other in various ways.

　　B. All the aerosols will cool the earth.

　　C. Aerosols can add nutrients to human beings.

　　D. Any kind of aerosols will warm the earth.

　　【答案】A

　　【解析】细节理解题。由第三段Some warm and some cool得知，BD选项错误, 与Some不符。从第五段的to the oceans，得知C也不对。由第五段最后一句aerosols can act on each other气溶粒A。

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