单项选择题

What is Cindy's chief responsibility now（）

A．Renewing promising car models.
B．Supervising production.
C．Doing market research.
D．Developing small cars.

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单项选择题For some people, it may be better （）

A．to wear a seat belt for health reasons
B．not to wear a seat belt for health reasons
C．to get a valid medical certificate before wearing a seat belt
D．to pay a fine rather than wear a seat belt

单项选择题This text is taken from（）

A．a medical magazine
B．a government report
C．a legal document
D．a government information booklet