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that are already among the hottest in the world28.In Paragraph 2,the author expresses his idea mainly by_A.telling a story B.giving examples C.using quotesD.listing figures29.How do increasing temperatures affect people?A.They limit people's income.B.They improve people's health.C.They reduce people's sleep time.D.They lead to poor relationship between people.30.What can be learned from Kelton Minor's words in Paragraph 5?A.Heat's impacts may be worse than expected.B.Policymakers have doubts about the study.C.The study adopted a new research method.D.Some cities have taken further action to fight the heat.31.It can be inferred from the last paragraph that.A.the study is widely applied in the worldB.the study is significant in sleeping researchC.the study has its limitation in some aspectsD.the study can represent the low-income peopleDIf you live in a region where winter weather is a regular risk,you are likely used to pouring salt on yoursidewalks.But how does it work?And how much salt do humans pour onto our planet's surface?The secondquestion is easier to answer:a lot.Salt doesn't directly melt ice,nor does it make snow simply disappear.Instead it makes water less likely tofreeze in a phenomenon called freezing point depression.In the case of simple rock salt,which is a rawer,lesspure version of table salt,each molecule()splits into smaller elements.Normally,when water freezes into ice,its molecules line up to form a stable,orderly structure.Salt interrupts the process,however,and temperaturesmust drop lower to overcome that interruption and for freezing to occur.But if salt needs to interact with liquid water,how does it do anything when temperatures are stubbornlybelow freezing,and water should already be in the form of ice?That's where cars help clear their own way bycreating friction and,in turn,heat.The friction allows for the ice that has already frozen to melt a little bit,makingit unlikely to freeze.Beyond rock salt's ability to clear icy streets,it can also be destructive.Chloride ions()can causewear and tear on vehicle s and facilities.Increasing chloride densities in North American lakes could begin toupset local eco logy and degrade sources of drinking water.Many local governments are looking for alternatives to rock salt.Other salts such as magnesium chloride andcalcium chloride work in the same way as rock salt,and they're perhaps even more efficient.Some experimentsare testing other ice-preventing solutions,including those that contain sugars instead of or in addition to saltsAnother approach relies more heavily on sand,which can mechanically make roads safer.All of thisexperimentation is aimed at ensuring people can travel in any weather condition-a Herculean task when winterbrings its worst.32.What's the purpose of the first sentence in Paragraph 2?A.To introduce the topic.B.To give some evidence.