单项选择题

How long do the volunteers work in a small barn on a fa……

Questions 29 and 30 are based on the following news. At the end of the news item, you will be given I0 seconds to answer the questions.
Now, listen to the news.

How long do the volunteers work in a small barn on a farm outside of Freeport, Illinois

A．5 hours.
B．10 hours.
C．17 hours.
D．20 hours.

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单项选择题By saying that drought is a slow emergency , the author means that

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