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special places currently not covered by forests.Further,Plan 2 helped to reforest regions thatdid not have many trees left,which brought animals and plants back to regions where they hadbeen lost.Now that we have a plan,it is time to put it into action!Let's make joint efforts and worktogether to make a big difference in saving our forests!28.Why is natural regeneration called a smart way?A.Farmlands are declining.B.It is environmentally friendly.C.Planting trees is relatively costly.D.Sensitive areas may not restore themselves.29.What does plan 2 show?A.The vastness of rain forests.B.The necessity of human intervention.C.The consequences of human activities.D.The possibility of natural regeneration.30.Who might suffer more according to paragraph 4?A.The small farm owners.B.Large farming companies.C.Agricultural organizations.D.Residents in reforested regions.31.What's the author's purpose in writing the passage?A.To fuel a debate.B.To prove a theory.C.To call for action.D.To present a phenomenon.DRoughly 42%of Americans are nearsighted today,compared to 25%in 1971.The WorldHealth Organization predicts that about half of the world's population will have nearsightednessby 2050.It's apparent that our eyesight is becoming increasingly poor,but researchers are onlynow beginning to understand why.Generally a childhood phenomenon,nearsightedness happens when the eyeball grows toolong from front to back,taking on more of an oval(椭圆形)shape rather than a sphere(球)Eyes have a "stop signal"so that they grow corresponding with the head,explains英语试卷第7页（共12页）