单项选择题

A technical innovation is necessary if we want to keep the grain production ______.

A．staggering
B．shrinking
C．soaring
D．suspending
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单项选择题
Responding to emerging diseases such as SARS is ______ to responding to a bioterrorist attack in which they resemble a sudden appearance of an agent spreading in a population.
A．identical
B．vertical
C．parallel
D．specific
单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
A．mean a warming up in the Arctic
B．raise the temperature of the earth's surface
C．prevent the sun's rays from reaching the earth's surface
D．account for great changes in the climate in the northern hemisphere
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