单项选择题

Many animals may be trained to do simple jobs if they know （）

A．who their trainers are
B．they will be praised by their trainers
C．they will get a reward
D．something dangerous will happen to them

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单项选择题
The Egyptians thought that ball playing was （）

A．childish
B．difficult
C．not enjoyable
D．worthwhile
填空题
A.report B.short C.recorder D.worth
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