单项选择题

Although fish have no vocal organs, they still are able to make noises.

A. signals
B. bubbles
C. sounds
D. ripples
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单项选择题
Foreign military aid was prolonging the war.
A．broadening

B．worsening
C．extending

D．accelerating
单项选择题
The high-speed trains can have a major impact on travel preferences().

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