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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单项选择题
When doing business in the Arab world, do not be surprised if your meeting is interrupted several times by people who come into the room ______, whisper, or speak softly to the person with whom you are talking, and leave.
A．unannounced
B．unannouncing
C．unannounce
D．to announce
单项选择题
He______ a well meant but unsuccessful campaign to ease East West tensions calling for arms reduction and a summit of the nuclear powers.
A．embarked on
B．reckoned on
C．caught on
D．dwelt on
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