单项选择题

A．Sherry
B．Sandy
C．Susan
D．Sharon
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单项选择题
A．To urge children to get enough sleep.B．To relieve the burden of school children.C．To dissuade teenagers from staying up late.D．To tell Americans to have 9 hours of sleep every night.
A．To urge children to get enough sleep.
B．To relieve the burden of school children.
C．To dissuade teenagers from staying up late.
D．To tell Americans to have 9 hours of sleep every night.
填空题
The seasons of high air pollution in Australia each year usually are ______.
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