单项选择题

Elephants can be used to do some heavy jobs because______.

A． they can eat a lot
B． they are very heavy, too
C． they are very strong
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单项选择题
Many scientists are working hard to______.
[A] make monkeys get in crops and drive trains
B. make monkeys guard house like dogs
C. make bears get in crops
单项选择题
Why didn't the driver answer the question asked by the man when they passed the door
[A] Because it was too difficult for him to give the answer.
B. Because it was answered by Einstein.
C. Because it was too easy.
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