The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of ___ 9-story building.  
A．the; theB．a(chǎn); aC．a(chǎn); theD．the; a
D
考查冠詞的用法。第一空用the+n表示類別，是指blue whale 這一類動(dòng)物；第二空用a表示泛指。  
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