单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He told Bob not to study late at night.
B．He had often advised Bob to study.
C．Bob is too tired to study any more.
D．Bob didn’t hear the alarm.

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Urban centers located along rivers result in the fact that ______.

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______ have brought about environmental problems attendant on river use.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。