每年的阳春三月，来自全国各地、各行各业、各个民族的人民代表会聚在北京人民大会堂召开全国人民代表大会，听取中央政府工作报告、最高人民法院工作报告、最高人民检察院工作报告。这体现了我国的根本政治制度是（      ）

细胞的分化、衰老和凋亡是普遍存在的生命现象。下列有关叙述正确的是（    ）

Liu Tao:Hi,Mike.Nice to meet you.

Mike:Nice to meet you,too.

Liu Tao:What date is it today?

Mike:It's May 15.What subject do you have in this morning?

Liu Tao:We have math,Chinese,art and PE.

Mike:Oh,I like PE very much.What's your favourite subject?

Liu Tao:My favourite subject is English.But we don't have English today.

Mike:What a pity! Do you like PE?

Liu Tao:No,I don't.

Mike:It's time for class.Let's go.

电影院的座位排列时，后一排总比前一排高，并且每一横排呈圆弧形，这是为了____ ．