单项选择题

Questions 14-17 are based on a lecture in a college class. You now have 20 seconds to read Questions 14-17. What are the students going to do during this class period

A．Watch a slide show about trees.
B．Learn how to prevent Dutch elm disease.
C．Study the history of the campus buildings and grounds.
D．Look at examples of trees on campus.

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单项选择题

What was the good news for scientists

A．The underground oil resources have not been affected.
B．Most of the desert animals and plants have managed to survive.
C．The oil lakes soon dried up and stopped evaporating.
D．The underground water resources have not been polluted.

单项选择题

The use of Ecstasy______.

A．is usually fatal
B．is less dangerous than the authorities believe
C．is harmless when used as a dance drug
D．none of the above

Questions 14-17 are based on a lecture in a college class. You now have 20 seconds to read Questions 14-17. What are the students going to do during this class period 您的浏览器不支持 audio 元素。

Questions 14-17 are based on a lecture in a college class. You now have 20 seconds to read Questions 14-17. What are the students going to do during this class period