单项选择题
Distinctive sound refers to ______.
A. allomorph
B. phoneme
C. phone
D.minimal pairs
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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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单项选择题
Jackie complained that nobody was doing anything to ______.
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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are → is
high → higher
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as → while but
either → too