3¹⁰⁰¹×7¹⁰⁰²×13¹⁰⁰³的末尾数字是（　　）

①在△ABC中，若sinA＞sinB，则必有cosA＜cosB；

②在△ABC中，若a，b，c成等比数列，则角B的取值范围为 $(0,\frac{\pi }{3}$ ；

③等比数列{a_n}中，若a₃=2，a₇=8，则a₅=±4；

④等差数列{a_n}的前n项和为S_n，S₁₀＜0且S₁₁=0，满足S_n≥S_k对n∈N^*恒成立，则正整数k构成集合为{5，6}

⑤若关于x的不等式（a²﹣1）x²﹣（a﹣1）x﹣1＜0的解集为R，则a的取值范围为 $\left(-\frac{3}{5},1\right)$ ．

其中正确结论的序号是____．（填上所有正确结论的序号）．

D

    Our school is in Beijing. It isn't very big but it is very beautiful. There are a lot of trees in it. I'm in Class Two, Grade Seven. The walls of our classroom are white. There is a blackboard and some pictures on the wall. Our classroom is very clean （干净的）. There are 45 students in my class. Mr. White is our English teacher. He is from England. I like English very much. Mr. White is very friendly to us. He likes China and he is learning（学习）Chinese now. He can speak some Chinese. My father and mother are English teacher too. They often help me with my English. My classmates are very friendly. We are all friends. We love our school.

—Yes， it is       interesting film. I like it very much.