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.
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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.
单项选择题
A．He is likely to help.B．He is not willing to help.C．He doesn’t know a lot about computers.D．He also needs help.
A．He is likely to help.
B．He is not willing to help.
C．He doesn’t know a lot about computers.
D．He also needs help.
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