参考答案及重点解析
一、基础测试
A. 单词拼写
1. atmosphere 2. exploded 3. development 4. harmful 5. presence 6. oxygen 7. spreading 8.disappointed 9. forced 10. gradually
B. 句型转换
11. going round 12. filled with 13. which were 14. so lucky 15. by spaceship
C. 完成句子
16. in time 17. different from what he did 18. to play football here 19. filling, with sand 20. broke out