2．　 人类没有水和空气就不能活。

1．　 虽然天已很晚了，但他仍在写作。

26. I can’t understand this passage _______ there are no new words in it .

　 A. if　　　　 B. because　　　 C. though　　　　　 D. and

25. He hurt her _______ badly _______ she had to see a doctor .

　 A. too ; that　　　 B. so ; that　　　 C. either ; or　　 D. too ; to

24. _______ all the passengers are here , why don’t we start at once ?

　 A. As soon as　　 B. After　　 C. Now that　　　 D. When

23. Why not look up the new word in a dictionary _______ you don’t know it ?

　 A. if　　　　 B. that　　　 C. though　　　　　 D. whether

22. Which is bigger , the sun _______ the moon ?

　 A. or　　　 B. and　　　 C. but　　　 D. so

21. I’m looking for a babysitter (保姆) . She must be _______ too old _______ too young .

　 A. neither ; nor　　　 B. both ; and　　 C. either ; or　　 D. not only ; but also

20. Study hard , _______ you’re sure to have a good result in the exam !

　 A. but　　　 B. and　　　 C. for　　　 D. or

19. _______ he was out of the room , he turned back and knocked at the teacher’s door again .

　 A. Before　　　　 B. Since　　　　 C. As soon as　　　　 D. Until