单项选择题

  A major obstacle ______ English learning is the profound influence of the mother tongue.

A.for
B.on
C.to
D.over
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单项选择题
A discovery into the genetic makeup of tumors may deliver therapies that are ______ to individual patients.
A.entitled
B.affiliated
C.tailored
D.obliged
单项选择题
Previous research has shown that there are immediate ______ benefits from eating chocolate.
A.cognitive
B.imaginative
C.creative
D.competitive
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