单项选择题

During the construction of skyscrapers, cranes are used to （）building materials to the upper floors.

A．toss
B．tow
C．hoist
D．hurl

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单项选择题
The ties that bind us together in common activity are so （）that they can disappear at any moment.

A．trivial
B．fatal
C．tentative
D．feeble
单项选择题
Bill is an example of a severely disabled person who has become （）at many survival skills.

A．proficient
B．persistent
C．consistent
D．sufficient
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