单项选择题

What is one of the problems in the Biramichi River（）

A．Lack of oxygen.
B．Overgrowth of water plants.
C．Low water level.
D．Serious pollution upstream.

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单项选择题
What did the nurse have to do before getting the money from the English dentist（）

A．Refrain from going out with men for five years.
B．Stop wearing any kind of fashionable clothes.
C．Bury the dentist with his favorite car.
D．Visit his grave regularly for five years,
单项选择题
What was the speaker assigned to do in the past year（）

A．To study the problems of local industries.
B．To find ways to treat human wastes.
C．To investigate the annual catch of fish in the Biramichi River.
D．To conduct a study on fishing in the Riramichi River.
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