单项选择题

Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.

A．an easy
B．a playful
C．an open
D．a better
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单项选择题
The children trembled with fear when they saw the policeman.
A．wept
B．cried
C．ran
D．shook
单项选择题
We have got to abide by the roles.
A．stick to
B．persist in
C．safeguard
D．apply
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