单项选择题

Questions 11-13 are based on the following talk. You now have 15 seconds to read Questions 11-13.
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.

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单项选择题

For one of the studies, scientists from Canada noted a sharp decrease in ______ kinds of great sharks since the nineteen eighties.

A．8
B．9
C．10
D．11

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.

Questions 11-13 are based on the following talk. You now have 15 seconds to read Questions 11-13. What could be an effective way to control the red ants 您的浏览器不支持 audio 元素。

Questions 11-13 are based on the following talk. You now have 15 seconds to read Questions 11-13.
What could be an effective way to control the red ants