填空题

The seasons of high air pollution in Australia each year usually are ______.

【参考答案】

summer and autumn
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填空题
Australia’s single greatest source of atmospheric pollutants is ______.
单项选择题
A．At a party.B．On a picnic.C．On campus.D．At a friend’s house.
A．At a party.
B．On a picnic.
C．On campus.
D．At a friend’s house.
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