单项选择题

After he logged on the computer, he ______ a search engine.

A．launched
B．originated
C．opened
D．unfolded
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单项选择题
Dr. Slater's research will support the statement that man's sense of beauty ______.
A．is already there in the brain before birth
B．is cultivated after birth
C．is influenced by their parents
D．grows duller as years go by
单项选择题
Polluted air is deleterious ______ human health.
A．of
B．to
C．on
D．for
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