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
Many different animals may be taught to do some simple jobs if______.
A．they have enough food to eat
B．they learn they will get something to eat in return after doing them
C．they are sent to school
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