单项选择题

The scientists realized it would be too ______ to lift the ship on one piece because it was fragile.

A．bold
B．daring
C．risky
D．dangerous
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单项选择题
Norris has decided to ______ for some evening classes next term now that he has settled down in New York.
A．enroll
B．enlist
C．engage
D．enter
单项选择题
She often has bad colds in winter, ______
A．does she
B．doesn't she
C．has she
D．hasn't she
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