民族平等、团结、共同繁荣是我国处理民族关系的原则。下列做法体现了该原则的有（   ）
①尊重各民族的宗教信仰、风俗习惯、语言文字  ②帮助少数民族地区发展经济
③在少数民族聚居区实行民族区域自治制度          ④实施少数民族考生高考加分的照顾政策

在制作洋葱表皮细胞临时装片时，正确的染色方法应是(    )

    Frank Brown doesn't have a soccer ball, but his brother Alan does. They go to the same school and they love soccer. They play it at school with their friends. They think it's relaxing.

    Gina Smith has two soccer balls, three volleyballs, four basketballs and five baseballs and bats. She loves sports, but she doesn't play them—she only watches them on TV!

    Wang Wei doesn't have a soccer. He thinks soccer is difficult. He likes ping-pong. It's not difficult for him. He has three ping-pong balls and two ping-pong bats. After class, he plays ping-pong with his classmates.

—I spent two weeks in London last summer.

—Then you must have visited the British Museum during your stay, ________ you?