单项选择题

Landslides triggered by heavy rainfall impeded our best attempts at rescuing the victims.

A．encouraged
B．hindered
C．nullified
D．crowned
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单项选择题
Because it is tuned a fifth lower, the viola produces a sound that is more resonant than that of the violin.
A．more vibrant
B．more harmonious
C．softer
D．sadder.
单项选择题
The members of the dub voted to ______ the meeting until after lunch.
A．adjourn
B．adjoin
C．adjust
D．adjudge
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