文档介绍：Unit 2 Saving the Earth Topic 2 All these problems are very serious.
Section C
(1)________ of us knows how to stop the bad behavior.
(2) I knocked on the door but ___________ answered.
(3) They are beautiful but I am looking for ___________ useful.
(4) Is there ___________ you can do to help her?
(5) There’re 5 000 people living here and almost _________has his/her own car.
(6) He’s cleverer than ____________ I know.
(7) I’ve looked __________ but I can’t find it.
Fill in the blanks using something, anything, others, nobody, everyone, anybody, everywhere, none, other.
Review
None
nobody
something
anything
everyone
anybody
everywhere
In our daily life, we should face more environmental problems.
Can you say something about them?
oxygen
a special kind of oxygen
called “ozone” (O3)
氧气
a very big hole in the ozone layer,
too much harmful radiation from the sun
臭氧层
放射，放射物
，坑
，形成
，形式
In our daily life, we should face more environmental problems.
Can you say something about them?
CO2 carbon dioxide increase a lot, form a “blanket”, the heat from the sun can’t escape
二氧化碳
毛毯，毯子
渗出；逃跑；逃脱
cause the level of the sea to rise
called “the greenhouse effect”
or “global warming”
；起床；升起
温室效应
fewer trees
factory pollution
traffic pollution
the ozone layer
more carbon dioxide
Can you match them?
1a Read and understand.
Look at the following pictures and predict the main idea of the passage.
Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph.
The earth is billion years old. We humans have lived on the earth for only 35 000 years, but during this period, we have changed our planet a lot in many ways. Some things we’ve done are very good for the earth while some are bad.
_________ All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants a