单项选择题

A．To get information.
B．To know the related areas.
C．To know the latest news.
D．To make friends.
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填空题
Who suffer the breathing problems most according to the latest study
单项选择题
A．To present their results.B．To show off their results.C．To make themselves brave.D．To become active people.
A．To present their results.
B．To show off their results.
C．To make themselves brave.
D．To become active people.
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