著名史学家司马迁所著的《史记》是我国第一部纪传体通史，下列人物在《史记》中有记载的是（    ）

一池塘生态系统的结构和功能由于污染物的排放遭到破坏，停止排放污染物后，由于自身的净化作用，逐步恢复原状，这是由于生态系统具有（  ）

一个物体的速度——时间图象如图如示，则（   ）

I am on the way
I have been dreaming of being a volunteer1 I entered the university． Last summer, I could finally become a volunteer after the end　term  examination．
Step1 First experiencing
I thought I could have a good 2． But when I faced so many strangers, also my new workmates for the first time, I got nervous and  3almost all the time．
Step2 Start work
My first job of volunteering was 4 in summer． The kids were from families 5 low income(低收人)．They were at different 6，from primary school pupils to high school students．We talked about the 7，sadness and happiness．I told them that lessons were much more important than money，though I knew they did not have 8 lives．I 9that my experience would help them．
10，we needed to make better plans，and sometimes we didn’t know what to do at all，especially when11happened．
Step3 Wishes
I also12the older serving group．It seemed 13 more difficult to communicate with elders．I really hoped that I could bring14 happiness into their lives and help them more．
Anyway，I am on the way． 1 will15my dream，no matter what would happen the next day．

近几年，我国中学生出国留学的人数快速增长。请根据下面图表所提供的信息，简单介绍我国中学生的出国留学情况。另外，就是否支持中学生出国留学这一问题，请发表你自己的观点并给出原因。

   Every year, hundreds of thousands of Chinese students from junior high travel to foreign countries to study.  ……