二化螟是稻田中常见的一种害虫，通常会用农药来防治．某研究小组调查了一块1000平米的稻田中二化螟的种群密度，记录结果如下表．回答下列问题：

样方编号	1	2	3	4	5	6
样方面积（m2）	1	1	1	1	1	1
二化螟数量（只）	15	18	15	19	15	14

只有写对台阶上的字，小白兔才能爬上台阶。快来帮帮它吧！

If I were in _______position of the mayor, I wouldn’t allow _______factory like this standing on the bank of the Yangtze River．

阅读理解
A
    My name's Li Yan．I'm from Belling and I'm 13 years old.I study in No．1 Middle School．I'm in Class 2．Grade 7．I'm in the school music club．I can play the guitar well and I am good at playing the piano．Lang Lang is my favorite musician．I dream of being a musician like him．
    LiYue is my sister．We are twins(双胞胎)．We go to the same school， but she is in Class 4．Grade 7．She can play ping-pong very well and she is in the sports club．She likes Zhang Jike and Ma Long best．She often watches them play ping-pong on TV.
    My sister and I are learning how to swim．We are not good at it now,but we are trying our best(尽我们最大的努力)to learn it．It is a really healthy sport．
根据材料内容选择最佳答案。

邓小平南方讲话后，我国确定的经济体制改革的最终目标是（    ）