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B
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单项选择题
A．Dirty water and rubbish were thrown into the street.B．A deadly disease was spreading.C．There were many rats and flies.D．Many country people started to move into the city.
A．Dirty water and rubbish were thrown into the street.
B．A deadly disease was spreading.
C．There were many rats and flies.
D．Many country people started to move into the city.
单项选择题
A．About ￡ 2.B．About ￡ 3.C．About ￡ 4.D．About ￡ 5.
A．About ￡ 2.
B．About ￡ 3.
C．About ￡ 4.
D．About ￡ 5.
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