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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单项选择题
Why didn't Einstein give the lecture
A．Because he was too tired.
B．Because people there didn't know Einstein and the driver was familiar with the lecture.
C．Because Einstein had other things to do.
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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