读某日日照图（阴影部分表示黑夜，图中箭头所示为地球自转方向）回答问题：

爱默生有句名言：“人生最美丽的补偿之一，就是人们真诚地帮助别人之后，同时也帮助了自己。”对此理解正确的有（     ）
①帮助别人，别人就得帮助自己
②合作有利于倡导关爱他人、助人为乐的社会风尚
③助人与自助是人类合作的一种方式，帮助别人就是帮助自己
④人生最美丽的补偿应该是在帮助别人之后获得必要的物质回报

    I'm Sally . I was a shy girl . Bu this term , I decided to do a brave（勇敢）thing . In this term , we had a new subject to learn –physics . When our teacher asked someone to be the physics monitor（物理课代表）, I put up my hand and got the role . But it was not as easy as I thought .

    At the beginning , I found that many students did not hand in（上交）their homework , so I was a little worried . I shouted at the students . It made the students angry . One girl asked : “ Why are you shouting at me ? You're making it seem like it is all my mistake（错误）. ” Then I found that , it was my mistake in fact . I should talk to my classmates in a kind way and not get so angry .

    After this , I changed（改变）how I spoke . “ Excuse me . Could you please finish your homework ? ” I said . Later , I was surprised that many students understood me a lot better and finished their homework quickly.

    I found the best way to do this job is to talk with my classmates in a friendly way . Now , I am getting better and better with my classmates . This job makes me feel like I am growing up like a little tree day by day .

人体内下列结构中，能把静脉血变成动脉血的部位是（   ）。