单项选择题

A．Taking pictures under water.
B．Connecting pipelines.
C．Planting sea weeds.
D．Placing explosives under the water.
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单项选择题
American city buses before 1960s didn’’t allow black people to sit in the middle of the bus.
A．Y
B．N
C．NG
单项选择题
A．$1.53.B．$15.3.C．$5.3.D．$3.5.
A．$1.53.
B．$15.3.
C．$5.3.
D．$3.5.
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