单项选择题

People used to think that the earth was flat, ______

A．don't they
B．wasn't it
C．didn't they
D．usedn't it
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单项选择题
A word processing program is a kind of ______ that many people use to write with.
A．software
B．computer
C．printer
D．style
单项选择题
The result of Plateau's first experiment was that ______.
A．he went permanently blind
B．he stopped staring into the sun
C．he went blind for a month
D．he found what he was looking for
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