单项选择题

A baby might show fear to an unfamiliar adult,______ he is likely to smile and reach out to another infant.

A．if
B．whenever
C．whereas
D．because
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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
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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