单项选择题

When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.

A. grow
B. wrap
C. hide
D. test
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单项选择题
The dentist has decided to extract her had tooth.
A. take out
B. repair
C. pull
D. dig
单项选择题
Hundreds of years ago cloves were used to remedy headaches.
A. disrupt
B. diagnose
C. evaporate
D. cure
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