2. 外语
  3. The supply of fresh water continues to be a______for most environmentalists since, surprisingly, over 97 percent of the world’s

The supply of fresh water continues to be a______for most environmentalists since, surprisingly, over 97 percent of the world’s

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问题 The supply of fresh water continues to be a______for most environmentalists since, surprisingly, over 97 percent of the world’s water is un-potable because it comes from salty oceans.
选项
答案B
解析 The best answer is B. It makes sense according to the context that environmentalists would be "concerned" by the apparent lack of fresh water. Unlike fresh water, salt water is undrinkable by human beings.
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