48.(　　 )A. much　　　　 B. many　　　　　 C. few

47.(　　 ) A. rains　　 B. rain　　　　 C. raining

46.(　　 ) A. also　　　　 B. either　　　　　　 C. too

45.(　　 ) A.　 for　　 B. at　　　 C. of

44.(　　 ) A. keep　　 B. let　　　 C. make

43.(　　 ) A. events　　　　 B. problems　　　 C. questions

42.(　　 ) A. that　　　 B. whether　　　　 C. what

41.(　　 ) A. difficult　 B. important　　 C. comfortable

50.(　　 ) A. chance　　　　　 B. way　　　　　　 C. time

41-45BCAAB　 46-50CABBC

(C)

Everyone knows people need water． But do you know just how __41 _water is to living things ?

Maybe you feel lucky__42 _your life isn’t hard . But it doesn’t mean that you don’t have to worry about water．We all face serious water __43 _．

One of them is water pollution．All kinds of things from cars , factories , farms and homes __44 _our rivers , lakes and oceans dirty . Polluted water is very bad __45_people to drink . And dirty water is bad for fish, __46 _．Now , 34 percent of all kinds of fish are dying out .　　

How do cars and factories make our water dirty ? First，they pollute the air．Then，when it__47 _，the rain water comes down and makes our drinking water dirty．Dirty rain，called acid rain，is also bad for plants，animals and buildings．

__48 _people have made wells to get clean water from underground . But there still isn’t enough . Scientists__49 _ that in 30 years, more than half of the people in the world won’t have enough clean water .

When we don’t take care of our water，we are hurting everyone．It’s time to start learning how to save more water for__50 _ and our children．

49.(　　 ) A. green　　 B. red　　　　　 C. white