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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How many people become infected with malaria each year
A. Over 3 million.

B. Over 7 million.
C. Over 30 million.

D. Over 70 million.
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How much is the damage done to the United States each year by red ants
A. 3 billion dollars.

B. 4 billion dollars.
C. 5 billion dollars.

D. 6 billion dollars.
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