B.telomeresprogressivelyshortenwithage

C.physicalactivitiesstopwomenfromaging

D.shortenedtelomeresleadtomajorcancers

30.Whichofthefollowingtrue?

A.Cellsagefasterwithalesssedentarylifestyle

B.Physicalactivityisn’tnecessaryforthoseat80yearsold

C.Therelatedstudieswillbecarriedout

D.Thefindingistrueofyoungerparticipants

31.Wheredoyoumostprobablyfindthispassage?

A.InafashiontabloidB.Inatextbook

C.InasciencejournalD.Inabeautyposter
D

AmeetingbetweenAlibabaGroupChairmanJackMaandUSPresidentDonald TrumplastMondaysignalsthatTrump,whosetoughattitudetowardsChinahas eastdarkcloudsoverChina-UStraderelations,leftadooropenfor pragmatic(务实的)cooperationwithChinesecompanies,Chineseexpertssaid.

TheChinesebillionairereportedlyheldameetingwithTrumpinNewYork lastMondaytodiscusshowtheChinesee-commercegiantcouldcreatejobsby allowingUSbusinessestosellproductsintheChinesemarket.

ThiswasthefirstmeetingoftheUSPsidentwithahighlynoticeable businessmanfromChina,followingaseriesoftoughspeechesandactions, includingthreatstoimposea45percenttaxonChinesegoodsandselectionof Chinacriticsfortradepositions.