材料一：治世不一道，便国不法古，故汤武不循礼而王，夏殷不易礼而亡。反古者不可非，而循礼者不足多。

——《商君书·更法篇》

材料二：秦王扫六合，虎视何雄哉。挥剑决浮云，诸侯尽西来。

——李白《古风》

材料三：孝武初立，卓然罢黜百家，表章六经，遂畴咨海内，举其俊茂，与之立功。……如武帝之雄才大略，不改文景之恭俭以济斯民，随诗书所称，何有加焉。

——《汉书·武帝传》

   A plant makes its own food in its leaves . Water comes to the leaves through the roots . Air gets into the leaves through very small holes . The green coloring in the leaves uses the water and air to make the food for the plant . It also needs sunshine because a plant can make food only when the sun is shining.
   Animals and people could not live without green plants . They both eat plants . People and some animals also eat the meat of some animals and these animals eat plant