单项选择题

I don't know you want to keep the letter. I've ______ it up.

A．cracked
B．torn
C．broken
D．disposed
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单项选择题
The American society is ______ an exceedingly shaky foundation of natural resources, which is con nected with the possibility of a worsening environment.
A．established on
B．affiliated to
C．originated from
D．incorporated with
单项选择题
In his ______ to further his knowledge of the universe, man has now begun to explore space.
A．attempt
B．expedition
C．trial
D．chase
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