单项选择题

Several centuries ago, Spaniards and Portuguese came to the Amazon River area to _________.

A．plant trees
B．help the native Indians
C．colonize the area.
D．look for new residential places
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单项选择题
Why did the policewoman Kelly call the inspector
A．She found a suspicious thief.
B．She caught a murderer.
C．She needed help for she was in trouble.
D．She wanted to check whether anybody had broken into her house.
问答题
[听力原文]The effects of acid rain can be devastating to many forms of life, including human life. Its effects can be most vividly seen, however, in lakes, rivers, and streams and on vegetation. Acidity in water kills virtually all life forms. By the early 1990s tens of thousands of lakes had been destroyed by acid rain. The problem has been most severe in Norway, Sweden, and Canada. The threat posed by acid rain is not limited by geographic boundaries, for prevailing winds carry the pollutants around the globe. For example, much research supports the conclusion that pollution from coal-powered electric generating stations in the Midwestern United States is the ultimate cause of the severe acid-rain problem in eastern Canada and the northeastern United States.
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