Unit 21 Human BiologyLesson 2 Brain PowerMatch the key words with the definitions.Key wordsatom, billion,cell,nerve cell,organ1.one thousand million2.a part of the body that has a particular purpose, e.g.the heart,the liver3.the smallest piece of sth that can exist alone4.a tiny part of the body tha...

时间:2024-11-20 19:17栏目:中学教育

【英语】Unit21《lesson2brainpower》课件PPT（北师大版选修7）Unit21HumanBiologyLesson2BrainPowerMatchthekeywordswiththedefinitions.Keywordsatom,billion,cell,nervecell,organ1.onethousandmillion2.apartofthebodythathasaparticularpurpose,e.g.theheart,theliver3.thesmallestpieceofsththatcane...

时间:2024-11-20 09:53栏目:中学教育