单项选择题

If wool is submerged in hot water, it tends to shrink.

A．smell
B．fade
C．unravel
D．contract
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单项选择题
The plane will be taking off in approximately 10 minutes.
A. about
B. possibly
C. probably
D. rarely
单项选择题
Penguins do not suffer from the cold in Antarctica because their feathers secrete protective oil.
A．hide
B．warm
C．produce
D．absorb
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