单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What is the report mainly about

A．Irrigating desert areas.
B．Uses for cold seawater.
C．Techniques for preserving the environment.
D．The importance of conserving energy.
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单项选择题
What do the students mainly discuss
A．A physics exam.
B．A lecture they plan to attend.
C．An assignment.
D．Their favorite poets.
单项选择题
Why does the speaker mention air-conditioning
A．It’s another possible use for seawater.
B．It’s necessary for growing vegetables in hot climates.
C．It’s used to cool water used for irrigation.
D．It’s the primary use for electricity in the United States.
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