精选优质文档-倾情为你奉上Unit 1 Lead-in1 human beings 2 powered 3 greenhouse 4 far away 5 make a difference 6 breathe in 7 decreasing performance 8 four inches high 9 campaign 10 encourageEx 31 B 2 B 3 C 4 A 5 DEx 4 issues, pollution, deforestation, related, consumption, resources, threat, responsibilityEx 51 addictedsmoking 2 environmentconcern 3 expertwisdom4 possessiongreed 5 resourcesinexhaustibleEx.6 1 strategies 2 specific 3 consumers
