题型：语法填空（语篇） 题类：常考题 难易度：普通
新目标（Go for it）版初中英语九年级下学期Unit 13 We're trying tosave the earth! 第4课时Section B 2a~2同步练习
"When it comes to the Earth, there is no time to waste," says the Earth Day Network. And that is right. (protect) our environment is very important. World Earth Day (create) in 1970 to ask more people to protect our environment. On April 22 of each year, people around the world celebrate Earth Day.
Every year there is a special topic, and in 2016 it was "Trees for the Earth''， Earth Day that year was all about planting trees. They planned to plant 7. 8 billion trees within the next five years.
That's a big goal, and you might wonder why (tree) are so important. Because they can take in carbon dioxide(CO2) and improve the air quality(质量). CO2 is an element(成分) in our atmosphere, but humans make too much of it. person makes about 2.3 tons a year, which is bad for the environment.
Planting new trees is important because people cut down a huge number of trees. Last year, there were 3 trillion trees in world, about 139 billion in China. But according to China Daily, the world's total number has been almost cut in half since human civilization(文明) began.
That's 15 billion trees are cut down every year.
So we need (plant) more to make up for (弥补) those we lost. One tree can take in 21. 8 kilograms of CO2 per year. And it's still one of (cheap) and best ways to get rid of CO2.
But don't forget that we can also help protect the environment by (cut) down on the energy(能源) we use every day. Every little thing helps.
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