1. An energy source is renewable when supplies of it never ____________ ____________.

10.发生__________________

Part 3 Complete the following sentences according to the texts.

9.高达5摄氏度________________________

8.大体上,基本上________________

7.有关系,有影响________________________

6.忍受污染____________________

5.大量的_______________________________

4.通过燃烧化石燃料____________

3. 另一方面_____________________________

2.导致_____________________