填空题

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 water resource
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单项选择题
Physical fatigue is usually caused by ______ 。
A．too many stimulants
B．excess wastes in the bloodstream
C．diseases
D．lack of exercise
填空题
The journey took three days ______ (比我们原先所预计的多用了).
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