单项选择题

Silk, although it is considered a delicate fabric, is in fact very strong, but it is adversely affected by sunlight.

A. soft
B. sheer
C. fragile
D. refined
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There are some things in the class the teachers will not put up with.
A. tolerate
B. contribute
C. resist
D. prohibit
单项选择题
In spite of a problem with the faulty equipment, some very useful work was accomplished.
A. imperfect
B. temporary
C. emergency
D. reinstalled
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