单项选择题

When you walk in a street in this city, you should keep a ______ eye open for a thief.

A．bright
B．red
C．huge
D．sharp
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单项选择题
After he logged on the computer, he ______ a search engine.
A．launched
B．originated
C．opened
D．unfolded
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
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