单项选择题

A．An equatorial belt of faster moving material.
B．The solar sound.
C．A sun orbiting satellite.
D．An other planter.
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单项选择题
A．will not be realized in the near futureB．is still at a trial periodC．is but a dreamD．has been widely practiced
A．will not be realized in the near future
B．is still at a trial period
C．is but a dream
D．has been widely practiced
单项选择题
A．answer questions about its temperatureB．translate the sounds into imagesC．know how gases inside ebb and flowD．measure the pitch
A．answer questions about its temperature
B．translate the sounds into images
C．know how gases inside ebb and flow
D．measure the pitch
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