填空题

S8

【参考答案】

emigrants改成immigrants。
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单项选择题
A．It can cause flooding annually.B．It can carry diseases that affect animals.C．It can introduce too much salt into the soil,D．It can divert water from important crops.
A．It can cause flooding annually.
B．It can carry diseases that affect animals.
C．It can introduce too much salt into the soil,
D．It can divert water from important crops.
填空题
S9
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