“陈旭麓在《近代中国社会的新陈代谢》一书中说“满清王朝曾在抵御外侮的旗帜下领导过多次民族战争。这是一个转折点，民族战争失败的同时又意味着民族抵抗意识的全部丧失。”这里的“转折点”应该是（      ）

问答句配对,在右栏中找出与左栏相对应的答句。

①Hello, my name is Daming. ____      A. My telephone number is 56778843.

② How old are you? ____               B. P-E-N-C-I-L.

③What's your telephone number? ____      C. Thank you!

④Can you help me? ____          D. It's fifteen

⑤Sit down, please. ____           E. It's black and white

⑥How do you spell "pencil"? ____     F. Hi, Tony. Nice to meet you.

⑦This is my friend, Tony. ____        G. Football.

⑧What's eleven and four? ____     H. I'm twelve 

⑨What color is it? ____            I. Hello, I am Tom!

⑩What's your favourite sport? ____     J. Yes, of course.

某小组同学用卫生球做实验，研究萘的熔化过程，作出如图所示

的图象，图中BC段表示　____ 　过程，在开始计时第6min，萘处于　____ 　状态，由图象还可以知道萘的熔点是　____ 　℃．