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

48.(　　 ) A. wait　　　　 B. waiting　　　　　 C. waited

47.(　　 ) A. Luckily　　　 B. Luck　　　　　 C. Lucky

46.(　　 ) A. big　　　　　 B. strong　　　　　　 C. heavy

45.(　　 ) A. looked up　　 B. picked up　 C. turned up

44.(　　 ) A. A few　　 B. A little　　　 C. A lot

43.(　　 ) A. stay　　　　 B. live　　　　 C. come

42.(　　 ) A. so　　　 B. and　　　　　 C. because