单项选择题

I find Peter always______ his classmates in a debate, even though the argument is not sufficient.

A．backs up
B．backs down
C．backs out
D．backs off
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单项选择题
Steven began his work with______ and soon cut the tree up into logs.
A．vigor
B．verge
C．void
D．vein
单项选择题
The heavily populated area was a breeding place for______ diseases.
A．powerful
B．infectious
C．influential
D．suspicious
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