单项选择题

Questions 18-20 are based on the following monologue introducing the consequences of the Gulf War. You now have 15 seconds to read Questions 18-20.
The consequence of the Gulf War that has called the concerns of the scientists is ______.

A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the rims.

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The student cannot register because ______.

单项选择题

What is the topic of this passage

A．The largest library in the United States.
B．A special system for numbering books.
C．Finding books in a library.
D．Finding a needle in a haystack.

Questions 18-20 are based on the following monologue introducing the consequences of the Gulf War. You now have 15 seconds to read Questions 18-20. The consequence of the Gulf War that has called the concerns of the scientists is ______. 您的浏览器不支持 audio 元素。

Questions 18-20 are based on the following monologue introducing the consequences of the Gulf War. You now have 15 seconds to read Questions 18-20.
The consequence of the Gulf War that has called the concerns of the scientists is ______.