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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填空题
The author believes that many discoveries in science, engineering and the arts mix ideas from ______.
单项选择题
Which of the following is NOT true in the case of pathological fatigue
A．You arc involved in so many activities that you have to be in two places at once.
B．Your body has a disease.
C．The cells fail to deal with fighting the disease and keeping you alive at the same time.
D．The first thing to do is to cure the disease.
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