单项选择题

A．He took a tour of the city.
B．He read about it.
C．He wrote an article about it.
D．He worked there as a guide.
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单项选择题
A．A plate.B．A pear.C．A ball.D．An egg.
A．A plate.
B．A pear.
C．A ball.
D．An egg.
填空题
Two-thirds of the freshwater on Earth is locked in ______.
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