单项选择题

Many pure metals have little use because they are too soft , rust too easily, or have some other （）

A．drawbacks
B．handicaps
C．bruises
D．blunders

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单项选择题
The prison guards were armed and ready to shoot if （）in any way.

A．intervened
B．incurred
C．provoked
D．poked
单项选择题
Some American colleges are state-supported, others are privately （）and still others are supported by religious organizations.

A．ensured
B．attributed
C．authorized
D．endowed
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