单项选择题

A．Write their lab report.
B．Find out Professor Smith’’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.
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单项选择题
A．Taking pictures under water.B．Connecting pipelines.C．Planting sea weeds.D．Placing explosives under the water.
A．Taking pictures under water.
B．Connecting pipelines.
C．Planting sea weeds.
D．Placing explosives under the water.
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
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