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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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 plantet.
单项选择题
The Enlightenment thinkers see persons as citizens of the world . That means______
A．they think people in the world should obey the same rules
B．people shouldn’t have their own religion and lives
C．people don’t belong to any particular groups
D．people should be ruled by the same laws
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