单项选择题

What did they find out

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
According to the context tooth transplanting ______.
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
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