单项选择题

Unlike competitive running , race walkers must always keep some portion of their feet in contact with the ground.（）

A．run
B．runner
C．runners
D．running race

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单项选择题
It was not until she arrived at the classroom she realized she had forgotten her coursebook.（）

A．and she realized
B．which she realized
C．then she realized
D．that she realized
单项选择题
All living creatures pass on inherited traits from one generation to other .（）

A．the other
B．another
C．others
D．other one
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