从方框中选择最佳选项完成对话, 有两项多余。

a. What should I do?

b. It's wonderful.

c. Could I join your group?

d. What's wrong?

e. I'm sorry to hear that.

f. How do you learn English?

g. Tomorrow if you like.

Tom: Hi! Alice, you look so sad. ____.

Alice: I failed in the English exam.

Tom:____But you don't need to worry about it all the time.  

Alice: I really don't know how to study English well.____

Tom: I think you'd better study with a group.

Alice: Oh, that's a good idea.____

Tom: Certainly. And we can learn from each other.

Alice: Sounds good. When can I join you?

Tom:____

Alice: That's very kind of you.

①随着工业的发展，导致大量温室气体排放，全球气温升高

②随着光合生物的出现，大气中有了氧气，为好氧生物的出现创造了条件

③生活在草原上的斑马和猎豹都能迅速奔跑，是长期相互选择的结果

④4亿年前形成了原始的陆生植物，随后出现了适应陆地生活的动物

⑤某种兰花有专门为它传粉的蛾

下列史实按时间先后顺序排列，正确的是（   ）

①人民公社化运动    ②第一个五年计划完成

③抗美援朝          ④文化大革命的发生

“蚁穴溃堤”这一成语主要揭示了生物对环境造成的影响。