Unit 3 Language in use
导学目标：
1.掌握并正确运用单词：face
2. 能够正确使用冠词，准确读出数字。
自主预习：
根据句意及首字母或汉语提示填空
1. Our world is f_______________ many problem.
2. We shouldn’t throw away the r__________everywhere.
3. We arrived late because the _____ (交通) was busy.
4. The factory has produced a lot of p__________ so it should be closed down.
5. The population of China is too large. Many people feel ________ (worry).
6. – What’s the p_______ of Australia? -- About 19,400, 000
7. The i________________ po pulation is an environmental problem in many countries.
