单项选择题

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单项选择题
The phrase sine qua non in Para. 5, Line 1 possibly means ______.
A. the essential elements

B. the premise
C. the contribution

D. the advantage
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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