单项选择题

Which of the following is NOT a possible reason for whales dying（）

A. Pneumonia.
B. Brain infection
C. Over-population.
D. Over-eating.

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单项选择题
21（）

A.persuaded 
B.helped 
C.stopped 
D.warned
单项选择题
The distance from the center of England to south coast is about （）

A. one hundred miles
B. three hundred miles
C. one hundred and fifty miles
D. six hundred miles
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