单项选择题

In this passage "unstable" means （）

A．frightening
B．fast
C．shaky
D．undesirable

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单项选择题
The writer ends this story with （）

A．a serious thought
B．a suggestion
C．a joke
D．a warning
单项选择题
The phrase they do the chewing makes the rocks seem as though they are （）

A．important
B．alive
C．dangerous
D．uncomfortable
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