unit 3 computers 由句连篇——背佳句、学衔接，让作文流畅起来一、话题写作佳句必背 1．we have been cutting down too many trees, which causes birds and animals to lose their natural habitats. 我们一直在砍伐过多的树木，这使鸟类和动物失去了它们自然的栖息地。 2．water sources have become so badly polluted that some of the water is unfit to drink or to use. 水资源已经被污染得如此严重，以至于一些水已经不适合饮用或使用。 3．it's high time that we paid much attention to protecting our environment. 到了我们应该高度重视环境保护的时候了。 4．if we human beings don't take action to protect the earth from now on, we'll have nowhere to live in the future. 从现在起，如果我们人类不采取措施保护地球，我们在将来将没有地方生存。二、连句成篇并背诵(选用“therefore, meanwhile, as far as i'm concerned, besides, for example”过渡词衔接成文)
