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
We should not be made to______ the basic principle, namely, the need and desire of the adolescent to engage responsibility in the real pursuit of life and then to learn through responsibility.
A．lose sight of
B．lose track of
C．become blind of
D．give way to
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
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