单项选择题

Why is the demand for shark fins rising in Asia

A. Because there are fewer sharks in Asia.
B. Because shark fins can be used for medical purposes and for food.
C. Because shark fins are poisonous.
D. Because shark fins are expensive.
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What could be an effective way to control the red ants
A. To spread a kind of virus within the ants themselves.
B. To use fire to destroy them.
C. To create a kind of powerful poison to destroy them.
D. To raise other biological animals to kill them.
单项选择题
The scientists say one effect of shark fishing has been an estimated ______ decrease in some shark populations.
A. 9% B. 19%
C. 90%
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