单项选择题

______can be trained to work for us.

A．Only a few animals
B．Quite a few animals
C．Few animal
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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
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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