背话题佳句：
1.If wildlife disappeared from the earth, the environment and climate would be badly changed, the ecological balance would be broken and the biodiversity would be lost.
如果野生动植物从地球上消失，环境和气候将会变差，生态平衡会被破坏，生物的多样性会消失。
2.We believe as long as we take action immediately, we will live in harmony with wildlife.
我们相信，只要我们马上行动起来，我们就可以和野生动植物和谐相处。
3.It’s time we took measures to protect the river from being polluted.
是我们采取措施防止这条河流被污染的时候了。
4.The number of plants and animals on the earth is becoming smaller and smaller.
地球上的植物和动物的数量正变得越来越少。
5.Air and water are being polluted so that the environment in which animals live is destroyed.
空气和水正受到污染，结果动物生存的环境被破坏。
6.Elephants would be in danger of dying out if men were allowed to shoot them as many as they wished.
如果再允许人们随心所欲地射杀大象，大象就会有灭绝的危险。
7.With only about 1,000 pandas left in the world,China is desperately trying to clone more pandas and save the endangered species.
由于世界上仅存约1000只大熊猫，中国正全力地试图克隆更多的大熊猫以拯救此濒危物种。
背话题词：
1.live in harmony with nature与自然和谐共处
2.be kind to nature 善待大自然
3.the rules and laws of nature 自然规律
4.keep ecological balance 保持生态平衡
5.maintain biodiversity 保持生物多样性
6.lose the habitats 失去栖息地
7.conserve natural habitats 保护天然栖息地
8.nature conservation 自然保护
9.endanger the lives of 危及……的生命
10.wild animals and plants 野生动植物