我国陆地面积在世界各国中，仅次于（     ）。

2012年11月，白酒塑化剂风波再次引发食品安全领域的“地震”．塑化剂的化学式为C₂₄H₃₈O₄，对人体血液系统会造成损害．你认为下列说法正确的是（  ）

如图空间存在两个相邻的磁感应强度大小相等方向相反的有界匀强磁场，其宽度均为L，现将宽度也为L的矩形闭合线圈从图示位置垂直磁场方向匀速拉过磁场区域，则在该过程中能正确反映线圈中所产生的感应电流或其所受安培力随时间变化的图象是：（规定线圈中逆时针为电流正方向，线圈受安培力方向向左为正方向）（   ）

    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 .