单项选择题

Questions 16 to 20 are hsed on the following passage. At the end of the possage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
What would happen if there were no trees

A．The land would become fertile.
B．Heavy rains would clean the tropics.
C．The rich, fertile soil couldn’t be retained.
D．There would be no agricultur
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单项选择题
According to the woman, what may limit the use of the material in cars
A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
单项选择题
Which of the following is NOT included in the plan
A．Reducing mother-to-child transmission of AIDS.
B．Promoting AIDS prevention campaigns.
C．Receiving more donations from entrepreneurs.
D．Reducing new infections by 50 percent in the next five years.
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