单项选择题

The tragedy could have been （）if the crew had followed safety procedures.

A．converted
B．diverted
C．reverted
D．averted

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单项选择题
The museum sends（）porcelain objects to specialists to be restored.

A．feeble
B．foul
C．fitting
D．fragile
单项选择题
Professor Wilson has a speaking（） for this weekend, so-he declined the invitation by his friends for dinner.

A．employment
B．enhancement
C．engagement
D．assignment
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