根据短文内容及首字母提示,填写所缺单词,使短文意思完整。每空限一词。
Air is very important to everything that lives. But the
air we breathe is g 1. dirty. People all over
the world are looking for w 2. to make it clean
again.
Have you ever watched the smoke from chimneys(烟囱) r 3. high in the
air? Have you s 4.___ the smoke from cars and trucks on
roads or the smoke from planes? The smoke is h 5. to
everyone, especially old people and children. If we want to keep well and
strong, we need to breathe f 6. air.
With more and m 7. factories
everywhere and more and more cars, trucks and planes, it is getting harder and
harder to do with the air p 8. .
Scientists have a 9. found
ways to stop or slow down some of the things that make the air dirty. They will
not stop working u 10. we have clean air again.