505.With the country's population reaching 1.6 billion in the mid of this century,most of China's rivers,including the Yellow River，_______.
A.is drying up
B.will be drying up
C.dry up
D.have dried up
506.I ______ my son to Laos for sightseeing.
I would rather you didn't do that,for the bird flu _____ several lives there.
A.took;claimed
B.am taking;has claimed
C.took;had claimed
D.will take;claimed
505.答案是B;考查动词的时态。根据下文in the mid of this century的暗示，此处应该指代将来。
506.答案是B;would rather sb.did/didn't do sth.表示对现在或将来情况的虚拟，由此推断take动作尚未发生，而下文夺去生命已成事实，故选B。
