单项选择题

Very few scientists ______ completely new answers to the world's problems.

A．come up with
B．come out
C．come round
D．come up to
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单项选择题
______ the people directly involved in the tourist industry may benefit, others may find that they are worse off.
A．If
B．But
C．Whereas
D．Whether
单项选择题
Recently a number of cases have been reported of young children ______ a violent act previously seen on television.
A．modifying
B．duplicating
C．accelerating
D．stimulating
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