【人教版】九年级全册 Unit 13 We' re trying to save the earth 第4课时 同步习题课件

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Water pollution has always been a big
problem around the world. With the developmen
of modern society and with cities growing, more
and more water gets polluted. The saddest par
a bout the whole problem is that most water
pollution can
Then how does water
pollution take place
Lots of water pollution in rivers and lakes is
2 by factories. The factories pour plenty o
waste water into rivers every day The pollutants
from the waste water go down the rivers and
plants and animals in many places. They are
very especially 4 to plants and animals in the
river. Besides that, people on ships or boats may
make water dirty as well. some people stand on ships
ust to enjoy the sun, but at the same time, they
sometimes throw 5 into the water. they dont
think they are doing something wrong because the
bad 6 cant be seen in a short time
You may think that water pollution doesn
affect you a lot, but you re wrong much of the
polluted water 7 goes into land. Then it 8
destroy plants and crops grown in the area. It can
even make our drinking water dirty And its 9
and difficult to make the dirty water clean. The
public needs to learn more about the pollution so
hat everyone can take action to do 10 usefu
o prevent it and keep our water clean