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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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
单项选择题
The dairy industry has taken great pains to increase the number of products from which the butterfat has been______.
A．revived
B．removed
C．excluded
D．isolated
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