20.   The invention of _____ wheel is a great contribution to _____ man.
A. the;  /   B. / ;  / C. a;  the   D. / ;  the

21.   【2009北京】The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of ___ 9-story building.
A. the; the   B. a; a   C. a; the   D. the; a

22.   【2008湖南】Have you heard ______ news？The price of _______ petrol is going up again!　
A. the, the                     B. 不填，the 
C. the, 不填                 D. 不填，不填　

②   不可数名词泛指时不用冠词，特指时用定冠词

Water is a liquid.水是液体。        
Music is an art. 音乐是艺术。
The water in the bottle goes bad.

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