单项选择题

Louis Brailele designed a form of communication enabling people to______ and preserve their thoughts by incorporating a series of dots which were read by the finger tips.

A．retain
B．visualize
C．convey
D．transfer
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单项选择题
You can' t help but hear commercials; every few minutes the program is interrupted to give you one advertising______.
A．so on and so forth
B．more or less
C．something or other
D．sooner or later
单项选择题
If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either______ or abandoned.
A．testified
B．ascertained
C．violated
D．modified
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