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28.What is the third paragraph mainly about?A.The efforts made by the United NationsB.The rapid development of AfricaC.The practical ways to cure AIDS.D.The terrible situations of HIV infections.29.In which way will the rice be used at the lowest cost?A.By transforming it into proteins.B.By attaching it to the HIV virus.C.By processing it into a cream.D.By adding it to an oral drug.30.What can we infer about the genetic engineering process?●A.It requires further testing to ensure the safety.B.It has produced dangerous chemicals.C.It is intended for the developed world.D.It can prevent infections of HIV.31.From which is the text probably taken?A.A biology textbook.B.A health magazine.C.A social web page.D.A first aid brochure.In the rich countries of the West,the electric vehicle revolution is well underway.Climate-consciousconsumers drive Teslas or Polestars for reasons of morality and fashion.Poorer countries are alsoexperiencing a wave of electrified trend.In Bangladesh,electric three-wheeler taxis,known as tuk-tuks,are rapidly replacing gas-powered ones on the streets.Such electric vehicles are climate friendly,costeffective,and help reduce air pollution.Yet a glance under the hood (of these vehicles reveals a poisonous secret:each tuk-tukruns on five massive lead-acid batteries,containing almost 300 pounds of lead in total.Every year and ahalf or so,when those batteries need to be replaced and recycled,about 60 pounds of lead leak into theenvironment.Battery recycling,often at small-scale unregulated factories,is a highly profitable butdeadly business.Lead is dangerous,and any exposure to it is harmful to human health.Lead that has entered theenvironment hurts people on an extraordinary scale.The numerous ways lead enters air,water,soil,and homes across the developing world-and the enormous damage it does to human health,wealth,andwelfare-causes one of the biggest environmental crises in the world yet receives little attention.The World Bank estimates that lead kills 5.5 million people per year,which would make it a biggerglobal killer than AIDS,malaria,diabetes,and road traffic deaths combined.On top of the shockingdeaths,the social burden of lead poisoning is extraordinary,as is its contribution to global inequality-our research on the cognitive effects of lead poisoning suggests that it may explain about one-fifth of theeducational achievement gap between rich and poor countries.But unlike many challenges faced by developing countries,lead poisoning is a problem that isfixable with some attention and a relatively modest financial investment.Better monitoring,research,and rules can help protect children all over the world from the dreadful effects of lead poisoning andreduce the massive global costs it brings.32.How does the author describe the lead problem in paragraph 2?A.By making a comparisonB.By listing convincing numbers.C.By analyzing hidden causes.D.By explaining its working principle.33.What can we learn from the text?A.Lead poisoning may make poor societies poorer.B.Lead enters rich countries in various ways.C.Exposure to lead doesn't necessarily harm someone.D.Lead leaking has caused great panic in both countries.【海名遵·高二年级3月阶段测试·英语第5页（共8页）】