单项选择题

Silt and heavy run-off from farms in North Carolina were caused by（）.

A．Hurricanes Irene and Floyd
B．Hurricanes Floyd and Carla
C．an eruption from a volcano
D．deforestation of trees

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单项选择题

How did the members of the Society try to improve the environment（）

A．They made laws that protect birds.
B．They taught young people, helped pass laws that protect animals and so on.
C．They tried to make the world better.
D．Both B and

单项选择题

Which of the following statements is NOT true（）

A．Colds are always very dangerous.
B．Colds are often unpleasant though not dangerous.
C．Actually nothing can help get rid of colds.
D．The best way to keep colds away is to be healthy.