| Tornadoes, poweful,destructive wind storms, occur most often in the spring when hot winds       over flat land encounter heavy, cold air. 
 A. which to rise                               B.that rising 
 C.are rising                                    D.rising 
 答案是D 为什么 C哪里错了 
 The world's deepest cave, Pierre St. Martin in the Pyrenees mountains, is almost three times as deep             
 a) as the Empire State Building is high 
 b)that the Empire State Building is higher 
 c)is higher than the Empire State Building  
 d)and the Empire State Building's height 
 答案A 不过后面的is high是什么 读起来很变扭 
 
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