SinceIstartedworkingpart-timeatagrocerystore，Ihavelearnedthatacustomerismorethansomeonewhobuysthings．Tome，acustomerisapersonwhosememoryfailsentirelyonceheorshestartstopushashoppingcart（车）．Oneofthefirstthingscustomersforgetishowtocount．Thereisnootherwaytoexplainhowsomanypeoplegetintheirexpressline，whichisclearlymarked15items（件）orless，with20，25orevenacartloadofitems．

Customersalsoforgetwhytheycametothestoreinthefirstplace．JustasIfinishringingupanorder，acustomerwillsay，"Oops，Iforgottopickupafreshloafofbread．Ihopeyoudon'tmindwaiting，whileIgotogetit．"Fiveminuteslater，he'sbackwiththebread，abottleofmilk，andthreerollsofpapertowels．Whatisstrangeristhatcustomersalsoseemtoforgetthattheyhavetopayfortheirgroceries．InsteadofwritingacheckorlookingforacreditcardwhileIamringingupthegroceries，acustomerwillwaituntilIannouncethetotal．Then，insurprise，shesays，"Ohno，whatdidI dowithmycheckbook？"After5minutesofdiggingthroughherpurse，sheborrowsmypenbecauseshehasforgottenhers．ButIhavetotoleratecustomersbecausetheypaymysalary，andthat'ssomethingIcan'taffordtoforget．

21．Whatdoestheauthorsayabouthiscustomers？___

A．Theycannotcountnumbers．

B．Theysometimesjumpthequeue．

C．Theydon'tknowhowtoexpressthemselves．

D．Theybehaveasiftheirmemorieshadtotallyfailed．

22．Accordingtothetext，whoaresupposedtobeintheexpressline？___

A Customerswithnothingpurchased．

B．Customerswithnotmorethan15items．

C．Customerswithitemsbetween15and25

23．Whencustomersarriveatthecheck-outcounter，they___

A．findtheirpenslost

B．gobackandgetmoreitems

C．cannotwaittopayfortheirgroceries．

D．preferpayingbychecktopayingwithacreditcard．

24．Wecaninferfromthetextthat___

A．businessinthegrocerystorerunswell

B．theauthorfindshispresentjobfulloffun

C．theauthor'spart-timejobcallsforpatience

D．customersgotogrocerystoreswithoutplanning．