单项选择题


A．thus
B．so
C．though
D．worse
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单项选择题
The problem of undernourishment will become more critical because ______.
A．the world has spent a great deal on preparations for war
B．wealthy nations such as America would rather let surplus grain being uselessly destroyed than use it in relief of famine
C．poor irrigation system constitutes a great barrier to the agricultural development of regions of scarcity
D．the population is multiplying rapidly
单项选择题
Science at the present time is often applied to ______.
A．boost production of grain
B．construct first-rate transportation system
C．turn out sophisticated weapons used for mass killing in war
D．turn desert into fertile land
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