解释词语
清晰
形容词，指看得很清楚，很逼真。从语言表的角度上说，是指出语和表意，两者都要做到清楚明白。从形象的塑造上说，是指形象清楚、明朗。
Protect Wild Animals
Animals are our good friends．We live in the same Earth．Animals and people can't be separated from each other．But some animals are getting less and less．So it's important to us to protect animals，especially wild animals．Some people kill wild animals because of money．It's wrong．Now people need more places to live in．We explore the forest． Animals have less places to live in．The number of wild animals decreases year by year．So we should protect wild animals．
《在希望的田野上》作者____，____作家，歌词结构严谨韵脚明亮，形式整齐，语言明快，充分抒发了劳动人民幸福自豪，和对未来充满美好希望的感情，通过对现实的赞美和对未来的憧憬，抒发了____。
①会制造石器 ②会种植粟 ③会使用火和保存火种 ④保留了猿的某些特征
