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【参考答案】

B
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单项选择题
A．Working at a school.B．Staying at home.C．Studying at a distant college.D．Leaving school for home.
A．Working at a school.
B．Staying at home.
C．Studying at a distant college.
D．Leaving school for home.
单项选择题
A．Minerals.B．Chemical pollutants.C．Salt.D．Germs.
A．Minerals.
B．Chemical pollutants.
C．Salt.
D．Germs.
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