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
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
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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