根据对话内容，从下面方框中选择适当的句子补全对话，使对话内容

问题情景交际

根据对话内容，从下面方框中选择适当的句子补全对话，使对话内容完整、通顺。

Li Jun: Good morning,Doctor.
Doctor: Good morning.   1.____
Li Jun:   2.____ I've got a pain here.
Doctor: 3.____
Li Jun:Since yesterday evening. I couldn't sleep well last night.
Doctor:Let me see. Do you feel the pain here?
Li Jun:Yes. Is it very serious,Doctor?
Doctor:   4.____    But you'd better stay in bed for two days. And I'd like you to take these pills
              three times a day.   5.____
Li Jun:Thanks a lot,Doctor.
Doctor:You're welcome.

A. I don't think it's anything serious.
B. There's something wrong with my back.
C. How long have you had it?
D. You'll be all right in two or three days.
E. What's wrong with you?

答案

1. E 2. B 3. C 4. A 5. D

距今大概的年数	环境条件	发展情况
3.45～2.25亿年	气候温暖潮湿，水域密布	种类多，繁盛
2.25亿年至今	气候干燥，水域减少	种类减少，衰退