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 plantet.
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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．prevent people from having trouble with teethB．stop teeth from falling outC．put men on the moonD．transplant hearts and other organs
A．prevent people from having trouble with teeth
B．stop teeth from falling out
C．put men on the moon
D．transplant hearts and other organs
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