【单选题】This river is so big that it is impossible to build a _______ under it without modern technology. A. canal B. tunnel C. channel D. cable This river is so big that it is impossible to build a _______ u...
【简答题】根据第一句,完成第二、三句,每空填一个单词,使句意不变。 This river is three times as wide as that one. This river is _____ times the ______ of that one. This river is ______ ______ than that one.