单项选择题

Children going to school must have a chance to______ excess physical energy; children even more than adults require and enjoy physical exercise and games of all kinds.

A．work off
B．let off
C．play off
D．put off
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单项选择题
______ we have all the materials ready, we should begin the new task at once.
A．Since that
B．Since now
C．By now
D．Now that
单项选择题
Those who spend a lot of time with children may be aware of the difference in the way boys and girls respond to ______ situations.
A．alike
B．same
C．likely
D．similar
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