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
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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
单项选择题
Dogs can be used to guard a house for his host because______.
A．they are good at running
B．they are very kind and friendly to people
C．they are brave enough to get the strangers(陌生人) and thieves away from the house
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