55.Twins aren’t always twice as nice; they have much higher risks of being born ________ and having serious health problems.
(A) preliterate
(B) premature
(C) prejudiced
(D) prescribed

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統計: A(2), B(50), C(13), D(15), E(0) #664970

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#2655790
B.早產
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#3708292
Twins aren’t always ...
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