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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Attitudes to mental illness have shifted in recent years.
A. displayed
B. shown
C. changed
D. demonstrated
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Relief workers were shocked by what they saw.
A. moved
B. touched
C. surprised
D. worried
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