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
Trees, shrubs, flowers, and grass give character and interest to the parks.
A．vines
B．vegetables
C．bushes
D．weeds
单项选择题
Penguins do not suffer from the cold in Antarctica because their feathers secrete a protective oil.
A．hide
B．warm
C．produce
D．absorb
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