Paper，zhi，was a Chinese invention.2，000 years ago，Chinese people
（1）i papermaking.This zhi was made （2）o silk and was very expensive.Only the emperor and rich people could （3）a to use it.1，900 years ago，Cai Lun improved the paper﹣making process.He made cheap jinzhi out of tree bark and old cloth.The improvement in paper﹣making spread zhi far and wide，and many different （4）k of zhi were made by Chinese people.Xuan paper，a type of high quality rice paper，best shows the charm of
（5）t Chinese painting and calligraphy （书法）.Later，Chinese zhi spread to the West via the Chinese Silk Road.
Susan is the daughter of the famous environmental scientist Clark.But the woman has become an environmentalist on her （1）o .
In 1992，the first UN Earth Summit（峰会） was held in Rio de Janeiro.Thousands of people from around the world （2）h for it to talk about the Earth' s tomorrow.Twelve﹣year﹣old Susan and three of her friends formed a group.They raised money to travel to Rio to （3）a the summit.
At the summit，Susan said that the state of the environment （4）w her a lot. "You don't know how to fix the holes in our ozone layer （臭氧层）.You don't know how to bring back forests that once（5）g where there is now desert.If you don't know how to fix the Earth，please stop（6）b it!" The six﹣minute speech silenced all the people and made them fall into deep thinking.
After that speech，Susan began to lead "two lives." On the（7）t days，she was a schoolchild.But during her vacations，she （8）s internationally about the environment.
Now，nearly 30 years has passed since Susan made her Rio speech.Although many of the world's environmental problems have only become （9）w ，Susan does agree that some things are different now.More and more people give voice like Susan because they have realized the importance of the environment.
"Thirty years ago，I was fighting for my tomorrow.Now，I am fighting for the
（10）f of my sons，" says Susan，now a mother of two，who has kept calling people's attention to climate change.
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