老师
Hello everyone. Great to see you all bright and happy. We mainly talk about what we should do at school to protect the environment. Last time that's not enough. There are many other actions that are bad for our environment. Let's look at the following pictures. Predict the main idea of the passage. Easily predict the main idea of the passage is about the environmental problems. From picture 1,3, and picture five. They are about too many cars, cut into many trees and porridge, too much waste water. Do you know the other two factors? Let's read the passage and the truth. The titles for paragraph.
老师
two to six 在我们略读为段落，选择小标题时要顺航快速移动眼睛，把注意力集中在关键词上，即与带血的小标题相关的词上。遇到生词尽量猜不出来的可以跳过去。如给出的这 5 个小标题，前三个因为我们前几课的积累，对我们来说可以轻而易举地确定下来后两个小标题里面的新单词。我们不要急着到字典中去查它们的意思，只要在阅读中找到与它们相对的关键词，就可以确定它们是哪段的标题了。
老师
give it a try。 By now.
学生
The earth is 4.6 billion years old. We humans have lived on the earth for only 35000 years. But during this period, we have changed our planet a lot. In many ways, some thi查看隐藏内容