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
The Savor return ticket is NOT valid for ______
A．Saturdays.
B．Sundays.
C．any public holidays.
D．certain peak trains.
单项选择题
About how many websites have been withdrawn from the internet after the Sept. 11, 2001 in America
A．36
B．24
C．48
D．18
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