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
It was ______ that the boy was able to solve the problem so quickly.
A．amusing
B．amazing
C．annoying
D．appalling
单项选择题
Although buses in this district are scheduled to depart at a certain hour, they are often late.
A．planned
B．requested
C．obligated
D．loaded
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