题目

 I do hope that one day the Chinese language will become a ______ language, that is, everyone in the world will communicate in it. A. common           B. universal          C. popular            D. special 答案：B近年来，塔里木河中下游的胡杨林大量死亡，其原因 [     ]A、胡杨林树种退化，不适于日益干旱的环境 B、海洋输送水汽数量比往年少 C、塔里木河上中游引水灌溉增加，输送到下游的水量锐减 D、年平均气温降低，冰川融水减少