5.What does the underlined term “These changes” refer to?
A.Lower temperatures and more rainfall.
B.Higher temperatures and high humidity.
C.Making a record both in the past and now.
D.The two periods of the 40year investigation.
解析:代词指代题。上文中提到1970年以来,七月和八月的平均温度比1930年到1969年这段时间下降了1华氏度,而平均降雨量增加了0.33英寸。由此可知“These changes”指的是:温度降低,降雨量增多。
答案:A
6.Which of the following could be the possible sources for the increased moisture in the US Midwest?
A.Scientists' research and farmers' attention.
B.Less farmland and more plants.
C.More plants and irrigation practices.
D.Natural reservoirs and underground rivers.
解析:细节理解题。根据第三段内容和第四段中的第二、四句话和最后一句可知空气湿度增加的原因是C项。
答案:C
7.The studies show that in America's Midwest,________.
A.the average temperature is getting higher and higher
B.more and more farmland has been deserted
C.the amount of rain is closely related to the temperature
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