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 steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
A．continuously
B．quickly
C．excessively
D．exceptionally
单项选择题
A deadly disease has affected these animals.
A．contagious
B．serious
C．fatal
D．worrying
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