Air pollution is becoming worse. As is known to all, air to us is ________ water to fish. No one can imagine how human being can live without air.
举一反三
- Water and air are _______ to human beings. We can not live without them. (B2-U1) A: harbou B: function C: definite D: essential
- 中国大学MOOC: Air is to human _______ water is to fish.
- There isn't water or air on the moon, and ____ man can't live on it. A: a B: the C: one D: /
- Which of the following titles is a proper one? A: What should we do to prevent air pollution? B: An Exploration into the Measures to Prevent Air Pollution C: How does air pollution happen? D: Computer Retrieval
- Water is as _______ to fish as air is to man.