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．Desert area irrigation.
B．Uses for cold seawater.
C．The importance of conserving energy.
D．Techniques for preserving the environment.

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单项选择题

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 您的浏览器不支持 audio 元素。