单项选择题

Starting with the premise that there is life on the planet Mars, the scientist went on to develop his argument.

A．pretext
B．foundation
C．presumption
D．presentation
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单项选择题
In the twentieth century new drugs have markedly improved health throughout the world.
A．recently
B．consistently
C．supposedly
D．noticeably
单项选择题
Growing economic problems were highlighted by a slowdown in oil output.
A．accounted for
B．worked out
C．made prominent
D．taken for granted
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