单项选择题

Questions 17 to 20 are based on the following passage. At the end of the prorate, you will be given 15 seconds to answer the questions. Now listen to the passage. What can be inferred from the passage

A．Insects are the most adaptable creatures.
B．Insects would be out of control if nothing were done about the current situation.
C．Insects will someday devour all plants on the Earth.
D．Insects have developed resistance to both botanical and artificial poi- sons rapidly.

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单项选择题

According to the Vance-Owen plan, Sarajevo would be controlled by ______.

A．Muslims
B．Serbs
C．Croats
D．All above

单项选择题

Which of the following is NOT included in the scientists’suggestions

A．Farmers should use less insecticides.
B．Farmers should use a combination of two or three insecticides at once.
C．At certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect.
D．Farmers should regularly spray crops as a precaution against problems that are caused by large numbers of pests.

Questions 17 to 20 are based on the following passage. At the end of the prorate, you will be given 15 seconds to answer the questions. Now listen to the passage. What can be inferred from the passage 您的浏览器不支持 audio 元素。

Questions 17 to 20 are based on the following passage. At the end of the prorate, you will be given 15 seconds to answer the questions. Now listen to the passage. What can be inferred from the passage