单项选择题

Children ______ half of their 23 pairs of chromosomes(染色体)from each parent.

A．unite
B．bring
C．integrate
D．inherit
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单项选择题
His laziness makes it impossible for him to ______ success.
A．believe
B．receive
C．achieve
D．perceive
单项选择题
Many people ______ the defense of their country.
A．enrolled in
B．enlisted for
C．engaged in
D．engrossed in
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