7. are , good

6. got / gets , to

5. concentrate on

4. got , noisy

3. at , present

2. learn , from

5. Can all this be done easily ?

　　 ___________________________

　　 单元练习答案：

4. What must be done , for example ?

　　 ___________________________

3. Can anything be done about it ?

　　 ___________________________

2. Do the poorer countries have many problems ? What for example ?

　　 ___________________________