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S5

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单项选择题
A．Scientists thought there wasn’t.B．Scientists hadn’t got an answer.C．Scientists were uncertain.D．Scientists were still studying.
A．Scientists thought there wasn’t.
B．Scientists hadn’t got an answer.
C．Scientists were uncertain.
D．Scientists were still studying.
单项选择题
A．New York.B．Detroit.C．Los Angeles.D．San Francisco.
A．New York.
B．Detroit.
C．Los Angeles.
D．San Francisco.
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