单项选择题

A. No, it’s not good. B. So do I.
C. Yes, it is. D. I don’t know.
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单项选择题
The reasons why birds don’t get lost on long flights______.
A. have been known to scientists for years
B. have only recently been discovered
C. are known by everyone
D. will probably remain a mystery
单项选择题
The writer argued with his son because______.
A. he liked tortoises while his son liked hares
B. they disagreed about whether the tortoise was stupid
C. he liked the story of the hare and the tortoise while his son didn’t
D. he tried to teach his son the moral lesson of the story but the son rejected it
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