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
We can infer(推断) that
[A] people there hadn't seen Einstein before
B. people liked the driver more than Einstein himself
C. people knew Einstein very well
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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