单项选择题

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

A．smell
B．fade
C．harden
D．contract
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单项选择题
The train came to an (abrupt) stop, making us wonder where we were.
A．slow
B．noisy
C．sudden
D．jumpy
单项选择题
The question was discarded because it was (ambiguous).
A．biased
B．tentative
C．vague
D．renowned
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