阅读理解

      太阳花一种极普通的花。我喜欢太阳花，它是夏天里常见的花。太阳花的茎有红色的，有绿色的。那茎很嫩，似乎用手一掐，就会冒出水来。 太阳花的叶子很特别小而厚。叶子的表面像涂了一层薄薄的蜡，光而细腻（nì）。

      花朵并不大，多层的花瓣自然娇艳，单层的花瓣更俏（qiào）丽，真讨人喜欢。

      我喜欢太阳花，不只在于它颜色鲜艳，更因为它有强的生命力。它不怕日晒、风吹、雨打， 那样子总是蓬（péng）蓬勃（bó）勃。只要掐一根小小的茎，插在泥土了，不久就会生根开花。

中央纪委日前对l0起违反中央八项规定的典型问题发出通报，强调要加强执纪监督，保持高压态势，坚决刹住公款吃喝、送礼、旅游和铺张浪费等奢靡之风。这样做（   ）

①体现党的性质宗旨          ②赋予党的执政资格

③有利于巩固党的群众基础    ④创新了党的执政方式

    Lucy and Lily are twins . They are 13 years old . They look the same . But they have different hobbies . Lucy likes collecting stamps . She has many beautiful stamps . They're from different cities and countries . But Lily likes growing flowers . The flowers are all very beautiful . Lucy and Lily both like reading books . Lucy likes reading storybooks . But Lily likes reading science books . On Sunday , they usually ride bikes to the park . They can play with their friends there . Sometimes their parents go there , too .

一组数据有m个x₁，n个x₂，p个x₃，那么这组数据的平均数为（  )