①国家提高扶贫标准 ②国家提高个税起征点 ③建立覆盖全民的医疗保障体系 ④高考改革中“异地高考破冰”⑤实施PM2．5空气质量检测

若x＝3是方程a－x＝7的解，则a的值是（      ）．

根据短文，选择正确答案。

     My name is Zhou Dan. I'm a Chinese girl. I'm twelve. I'm from Zhengzhou, China. Do you know Zhengzhou? It's in the middle of China. I'm in No. 8 Middle School. There are about nine hundred students and fifty teachers in our school. Ours is a good school in Zhengzhou. I'm in Class 2, Grade 1. There are 49 students in our class, 29 girls and 20 boys. My English teacher is Miss Zhao Dan. Our names are almost the same, right? She is nice to me. We're good friends. I like English, and I like music, too. I want to find a pen friend. Please write to me.

如图，直线 交坐标轴于A，B两点，则不等式 的解集是（　　）

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绿的笔画顺序是____，共____画。