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%
D. 99%
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单项选择题
Which of the following is NOT the damage done by red ants
A. They can destroy the houses of farmers.
B. They can injure animals and farmers.
C. They destroy crops.
D. They get into animal feed.
单项选择题
The study was carried out by scientists from ______.
A. America and Australia

B. America and Canada
C. America and Austria

D. America and China
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