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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The high-speed trains can have a major impact on travel preferences.（）

A. force
B. influence
C. surprise
D. power

单项选择题

Customers often defer payment for as long as possible.（）

A. make
B. demand
C. postpone
D. obtain

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