Question

 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   

Answer 1

 D

 考查冠词的用法。第一空用the+n表示类别，是指blue whale 这一类动物；第二空用a表示泛指。