填空题


【参考答案】

there are no risk．．．→is
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填空题
maybe→may be
单项选择题
A．Musical noise from the neighborhood.B．Noise from factories.C．Noise on campus.D．Air-craft nois
A．Musical noise from the neighborhood.
B．Noise from factories.
C．Noise on campus.
D．Air-craft nois
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