如图，已知∠α和直角∠AOB，在∠AOB的内部以点O为顶点作∠β，使∠β=90°﹣∠α．（要求：尺规作图，不写作法，保留作图痕迹）

以下对相关数据解读准确的有（   ）

①手工生产始终占据主体地位

②民国时期农产品商品化率大幅提升

③农家自用粉比重占一半以上

④北洋政府时期机器化生产明显增加

    Hi! My name is Eric. I am an English boy. My1name is Li Mobai. I 2in China with my parents now.

    I3in No.1 Middle School in Shanghai. I'm in Class 1, Grade 7. I can 4 Chinese very well. I5good at math and music, too. I'm in the music club. I like6Chinese songs. Zhang Jie is my favorite star. I like sports very much. On weekends, I usually play7basketball and table tennis. Sometimes I go swimming8my parents.

    I have many good friends at school. I often9them with their English. So they think I'm a( n)10boy. They all like me very much.

    Do you like me? Do you want to make friends with me?

医学上常用“冷冻法”治疗咽喉炎，其冷冻剂是下列物质中的（　　）

我国通过实施计划生育政策来控制人口增长，取得了显著效果。下图为我国人口年增长曲线图。

图中信息可以说明（   ）