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
Mobile phone, e-mail and telephone ______ of people’s social communication nowadays.
A. are the most three common means
B. are the three most common means
C. are the most common three means
D. are three the most common means
单项选择题
A. show B. pick C. make D. check
A. show
B. pick
C. make
D. check
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