摘要:5.The water in the river has colour and smell because it is getting . A.more and more B.less and less C.cleaner and cleaner D.dirtier and dirtier (07)In 1620, about half the USA was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. China doesn't want to copy the USA's example. We're planting more and more trees. We've built the " Great Green Wall" of trees across northern part of our country.The Great Green Wall is 7,000 kilometres long, and between 400 and 1,700 kilometres wide. It will stop the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland in the south. More "Great Green Walls" are needed. Trees must be grown all over the world. Great Green Walls will make the world better.

网址:http://m.1010jiajiao.com/timu_id_2350201[举报]

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网