单项选择题

According to the passage, which of the following is NOT the cause of dropping temperatures（）

A. Volcanic eruptions
B. Mountain torrents
C. Crop and livestock production
D. The floods after the storm

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单项选择题
The statement guitars at Gap (Line 11, Para. 2) most probably means （）

A. the price of guitar is too high
B. the quality of guitar is too rude
C. the storage of guitar is too small
D. the design of guitar is too simple
单项选择题
The best title for this passage might be （）

A. Diversity and Unity
B. Diversity versus Unity
C. Psychology in Diversity
D. Professional Diversities
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