单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
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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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

What is the main idea of the passage

A．Malaria is uncontrollable.
B．Scientists are trying to develop insects resistant to malaria.
C．How to kill mosquitoes.
D．How useless science is in curing malaria.

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20. Why is the demand for shark fins rising in Asia 您的浏览器不支持 audio 元素。

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
Why is the demand for shark fins rising in Asia