单项选择题

If wool is put into hot water, it tends to shrink.

A. disappear
B. expand
C. break
D. contract
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Of all the planets in this solar system, Mercury is nearest the Sun.
A. most like
B. closest to
C. hotter than
D. heavier than
单项选择题
A plastic wheel can be as tough as a metal one.
A. useful
B. tight
C. weak
D. strong
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