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本题考查的是......

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When researchers carry out a dung-pile census, according to Plumptre, the area selected should be______.
A．a small one
B．a protected one
C．a monitored one
D．so large that elephants can’t move in and out of it freely.
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