单元词句梳理Section A（3a-3b）Were trying to save the earth!Unit 13必背单词 1.cruel adj.残忍的，残酷的2.harmful adj.有害的 _ n.伤害；损害 _ 对有害3.industry n.工业；行业4.law n.法律；法规 _ n.律师5.scientific adj.科学上的；科学的 _n.科学 _ n.科学家harmbe harmful to lawyer sciencescientist必背单词 6.shark n.鲨鱼7.fin n.（鱼）鳍8.chain n.链子；链条9.ecosystem n.生态系统必背短语 10._ 听说11._ 砍掉；割掉12._不但而且13._ 的数量14._ 到目前为止15._ 在顶端或顶部hear of cut off not onlybut also the number of so far at the top of 必背句子 16.This is _cruel,_harmful to the environment.这不但残忍，而且对环境有害。not only but also
