2. 外语
  3. Pollution in water is noticed______. The living things die because there is no ______ in the river or sea.

Pollution in water is noticed______. The living things die because there is no ______ in the river or sea.

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问题 Pollution in water is noticed______.
The living things die because there is no ______ in the river or sea.
选项 A、oxygen
B、poison
C、water
D、fish
答案A
解析 根据第三段倒数第二句：如果不对污水进行适当的处理，就会弄脏水源从而使水中的各种生命得不到它们所赖以生存的氧。
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