We have only one earth. It is the only environment for humans, animals and plants to live or grow in. However, we are polluting our earth every day. Good news is that the whole world has realized the serious problems and has taken action to fight against it.

    World No Tobacco Day (May 31)

    The first World No Tobacco Day is April 7, 1988. Since 1989, it was changed to be May 31st every year. The purpose of the World No Tobacco Day is to encourage people not to smoke.

    World Water Day (March 22, 1993)

    United Nations named 22 March as the first World Water Day in 1993. It's a day to celebrate water. It's a day to prepare for how we manage water in the future. It is celebrated around the world every year.

Earth Hour ( 2007)

    Earth Hour started for the first time on March 31, 2007 in Sydney, Australia. Since then, the last Saturday of every March was named as Earth hour day that year. On March 19, 2016, more than 350 famous buildings in 178 countries around the world turned off the lights for one hour to remind people to save electrical power.

    Actions in China to save our environment

    Smoking is not allowed in all indoor public places from 2014.This is the first time for China to care about personal health in public places.

    Ban(禁令) on free plastic bags. Since June 1, 2008, free plastic shopping bags are not allowed to provide in all supermarkets, shopping malls, and other places. It is to encourage people to use cloth bags or baskets for their shopping things.

梭伦改革的重要着力点之一是调节各阶层的政治权利。阅读下列材料：

材料一     改革以前的雅典是贵族的寡头专政，平民不仅无权议政，而且处于债务奴役的状态。改革以后，贵族阶级固然还是当政的阶级，然而……从前实际上并无公民权利的平民，现在在公民大会中也听得到他们的声音了。

——顾准《希腊城邦制度》

材料二     梭伦还必须面对雄心勃勃的新贵——那些人来自平民家族，对所谓“好父亲”集团的世袭贵族垄断特权耿耿于怀。

——波默罗伊等《古希腊政治、社会和文化史》

材料三    （梭伦）仍然把保卫法律的职责授予阿勒俄琶菊斯议会（长老会议），这个议会仍旧是宪法的监察人，它监督最大多数的和最重要的国家大事，惩处罪人尤其有最高的权力，无论是罚金或是判刑。

——亚里士多德《雅典政制》

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