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 nearestto 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 toughas a metal one.
A．useful
B．tight
C．weak
D．strong
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