单项选择题

Every camera we sell comes with a two-year ______.

A．guarantee
B．safety
C．confirmation
D．conservation
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单项选择题
The name of Vanity Fair is borrowed by Thackeray from ______ written by John Bunyan.
A．The Pilgrim"s Progress
B．A Modest Proposal
C．The Faerie Queen
D．The Shepherd Calendar
单项选择题
Carbon dioxide ______ from burning fuels is the most common of the so-called greenhouse gases.
A．producing
B．having been produced
C．to be produced
D．produced
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