单项选择题

This passage is mainly about （）

A．animal intelligence
B．mathematical skills
C．Clever Hans
D．unconscious behavior

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单项选择题
Farm animals in this passage arc for（）

A．farming
B．leather only
C．natural balance
D．man’s need
单项选择题
Why don't you try to come home ______ 9 o'clock.'
A．by
B．under
C．until
D．up to
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