阅读理解解题突破.pptx

阅读理解解题突破

Ⅰ.阅读理解Whenyoueatapineapple,thepineappleeatsyou?Now,dontbeafraid.Thisquestionisnotaboutapineapplemonsterthateatspeople.Infact,thecommonpineapplesoldinsupermarketscan“eat”alittlebitofyou.Whenyoueatsomething,yourstomachbreaksdownitslargemolecules(分子)intosmallerones.Inthesameway,pineapplescan“eat”youbybreakingdownthemolecules.

Pineappleshavecertainenzymesthatcanbreakdownproteins(蛋白质).Tounderstandthisbetter,youcanimagineapearlnecklace.Manysmallermolecules－thepearls－cometogethertoformthelongnecklaceofaprotein.Youcancutanecklacewithapairofscissors.Inthesameway,theenzymesinpineapples“cutup”proteins.

Proteinsareanimportantpartofthecells(细胞)inyourbody.Ifanenzymecanbreakdownaprotein,ithastheabilitytodamagecells.Whenyoueatpineapple,theenzymesinitwill“eat”thecellsofyourtongue.Thisiswhyyourmouthwillhurtifyoueattoomuchpineapple.Butluckily,thecellsinyourtonguewillbewellfast.Andafteryouhaveeatenthepineapple,thespecialenzymeswillendupgettingbrokendownbyyourstomach.Itwont“eat”youanymore.

Whydoespineapplehavetheseenzymes?Somescientistsbelievethattheyarecreatedbytheplanttopreventanimalsfromeatingitsimmature(未成熟的)fruits.Oncethefruitismature,itsenzymeswonthurtananimalstongueandthefruitwillbeokaytoeat.Anotherexplanationisthattheenzymeshelptheseedtomature.Theysendmessageswhentostartandstopgrowingtothecellsoftheplant.

()1.Whatdoesyourstomachdowhenyoueatsomething?A.Hurtpeoplesbody.B.Breakdownthelargemolecules.C.Createsomenewcells.D.Beamonstertoeatpeople.B

()2.Whataretheenzymeslikeaccordingtothetext?A.Apearl.B.Anecklace.C.Apairofscissors.D.Akindoffruit.C

()3.WhichfollowingcanyoulearnfromParagraph4?①Proteinsplayanimportantpartinyourbody.②Aproteinc