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．