问答题

Many big cities in the world____________(正面临淡水资源短缺).

【参考答案】

are facing the problem of lack of fresh water resource
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Satellite TV has encountered fierce competition from digital cable, which also has
A．improved picture quality
B．extended channel selection
C．distorted signal
D．both A and B
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The soldiers____________(由于没有休息一直向前走而感到非常疲惫)in a blizzard.
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