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29.Why is the roofop designed to be zigzag?A.To store more water.B.To plant diverse vegetables.C.To slow the speed of water flow.D.To make it look more attractive than other buildings.30.What can be inferred about the farm from paragraph 4?A.It uses food as fertilizer.B.It benefits the environment.C.It improves students'lifestyle.D.It produces vegetables and fruits.31.What does the author want to show by mentioning the outdoor classroom?A.Students can learn hands-on knowledge on the farm.B.Farmers working on the farm can become professors.C.The farm prevents government from offering people jobs.D.The farm harms the relationship between university and community.代暗二第的DPlastic is everywhere in our modern world.Its toughness makes it an extremely useful些material from household items to vehicle parts,but that same toughness makes it hard tobreak down for recycling or disposal ()However,Japanese scientists at the Universityof Tokyo have developed a new plastic material that can be broken down more easily and can焙self-heal and remember past shapes.Based on a kind of plastic called an epoxy resin vitrimer,which is brittle(脆性的)，the&new plastic boasts a huge range of advantages.Once scratched with a knife,it can completelypatch itself up after being heated to 150C for just 60 seconds.When shaped into the shape ofa crane,then flattened,it can fold itself back into the crane shape by being heated up.It doesall of this much faster than others of its type.烟The new plastic can also break down easier.Even if it's discarded (into theenvironment,it still poses less of a problem than other kinds of plastic,which the team喀demonstrated by placing it in seawater for 30 days.It biodegraded by 25%and releasedmolecules()that are essential food for marine life.营The new plastic is more resistant to breaking.It can also repair itself,and can recover itsoriginal memorized shape.It even biodegrades safely in a marine environment,according toShota Ando,a researcher of the study.The material can be used in a variety of applications."Infrastructure materials for roadsand bridges are often composed of epoxy resins mixed with compounds such as concrete andcarbon,"said Ando."By using the new plastic,these would be easier to maintain as theywould be stronger and healable using heat.Unlike conventional epoxy resins,this newmaterial is hard but stretchable,so it could also be expected to strongly bond materials ofdifferent hardness and stretch."32.What is the author's purpose in writing paragraphA.To introduce the topic of the text.B.To show the disadvantages of plastic.