单项选择题

Six months ago the World Health Organization recommended that cigarette smoking and the use of plywood and particle board ______ in enclosed areas.

A. be restricted
B. should restrict
C. will be restricted
D. must be restricted
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单项选择题
A．sufferB．reflectC．overtakeD．offer
A．suffer
B．reflect
C．overtake
D．offer
单项选择题
The open-air method of drying food ______.
A．is the one most commonly used today
B．was invented by the American Indians
C．has been known for hundreds of years
D．tends to be unhygienic
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