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．A million dollars.B．25,000 dollars.C．Ten million dollars.D．95,000 dollars.
A．A million dollars.
B．25,000 dollars.
C．Ten million dollars.
D．95,000 dollars.
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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