阅读短文，并按要求完成后面的小题。

     Some children are talking about their favorite subjects and activities at school.

     Lucy: I think music is my favorite. I like listening to (听) English songs. I need to relax after a day’s work, so I usually listen to music after dinner.

     Kate: I like music, too. But I only listen to Chinese songs, like Jay Chou’s songs. I also like drawing. I want to be a great painter(画家). I also like taking a walk.

     Peter: I don’t like music or drawing. I like playing basketball. I am a good basketball player. Don’t you think it’s cool?

     Jacky: I am not a good basketball player, but I like running. It is good for my health. I run for half an hour a day. I want to be a running star like Liu Xiang.

     Andy: I am not like many boys. I don’t like sports. I think taking a walk is my favorite. I take a walk for an hour a day.

一个长方形有____个角，有____个角是直角。

阅读材料，回答问题

大气污染导致的雾霾，已经深度影响到了民众的生活，大气治理问题受到各方的重视。

全国人大及其常委会高度重视大气污染防治工作，2015年，全国人大环资委组成调研组，对大气污染防治法执法检查落实情况进行了跟踪监督。在京津冀区域，调研组听取汇报，与基层人大代表和专家学者、一线执法人员座谈交流，并深入企业实地了解情况，提出了坚决取缔“土小”企业的建议。在近年的全国“两会”上，人大代表就环境污染治理提出了各自的议案。十二届全国人大常委会表决通过的新的《中华人民共和国大气污染防治法》于2016年开始实施。

结合材料，说明全国人大代表、全国人大在治理雾霾中行使的职责及其作用。