单项选择题

The mother and father （）the nucleus，or the center，of the nuclear family.

A.forms
B.are formed by
C.in the form.of
D.form

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Small molecules hold the （）for convenient diabetes treatment.

A.profits
B.promise
C.wish
D.future

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The new century will see a significant and（）change in China.

A.far
B.deeper
C.far-reaching