Children arc very curious ___________.
A. at heart
B. on purpose
C. in person
D. by nature
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请阐述遗传学的三大定律并以此解释生物的多样性和变异性。
They had two daughters, one a baby,___________a girl of 12.
A. other
B. the other
C. one other
D. another
--Remember the first time we met, John --Exactly. You ______ in the library.
A. were reading
B. had read
C. have read
D. read
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