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【参考答案】

B
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单项选择题
A．Similar.B．Simple.C．Difficult.D．Different.
A．Similar.
B．Simple.
C．Difficult.
D．Different.
单项选择题
A．They had no pollution.B．They had small boats.C．They could not think.D．They could not dive deep.
A．They had no pollution.
B．They had small boats.
C．They could not think.
D．They could not dive deep.
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