（2015•齐齐哈尔）保护生物的多样性，最有效的措施是建立自然保护区．

“青春啊青春，美丽的时光，比那彩霞还要鲜艳，比那玫瑰更加芬芳……”这优美动听的歌词表达了（    ）

人类早期文明最先诞生于亚非地区的大河流域，重要的有①古代埃及文明②古代两河流域文明③古代中国文明④古代印度文明。下列有关它们的文明成就，搭配不完全正确的一组是（　　）

从方框中选择最佳选项完成对话，有两项多余。

A. Who is the main character in it?

B. It's a good action film.

C. It was fantastic.

D. What kind of film is it?

E. What do you think of it?

F. Where and when shall we meet?

G. You'll have a chance next time.

A: Hi, Daming. Did you go to the concert last night?

B: Yes, I went there with my parents.

A: ____

B: Very wonderful. Some famous singers like Zhu Zhiwen and Li Yuchun sang songs at the concert.

A: What a pity! I didn't go there because I had to look after my sister at home.

B: ____ By the way, would you like to see a film with me tonight?

A: Yes, I'd love to. ____

B: It's an action film.

A: Great! I like action films. What's the name of it?

B: Chinese Zodiac(《十二生肖》). It is my favourite action film.

A: ____

B: Jackie Chan. Maybe this is his last action film.

A: ____

B: What about 7:00 at Hongxing Cinema? The film begins at 7:20.

A: OK, see you then.

B: Bye.

如图所示的电路中，电源的电动势E和内阻r恒定不变，电灯L恰能正常发光，如果滑动变阻器的滑片向b端移动，则（  ）