单项选择题

Most surveys find that people are reluctant to place themselves at either the top or the bottom of the social ladder.

A．uncommon
B．uncertain
C．unwilling
D．voluntary
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单项选择题
A．roleB．leadC．virtueD．roll
A．role
B．lead
C．virtue
D．roll
单项选择题
The synthetic fibers produced in that large factory account for one third of all the fibers turned out in the are
A． constituteB. consist ofC. instituteD. result in
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