Weeachhaveamemory.That’swhywecanstillrememberthingsafteralongtime.Somepeoplehaveverygoodmemoriesandtheycaneasilylearnmanythingsbyheart,butsomepeoplecanonlyrememberthingswhentheysayordothemagainandagain.Manyofthegreatmenoftheworldhavegotsurprisingmemories.Agoodmemoryisagreathelpinlearningalanguage.Everybodylearnshismotherlanguagewhenheisasmallchild.Hehearsthesounds,remembersthemandthenhelearnsspeak.Somechildrenarelivingwiththeirparentsinforeigncountries.Theycanlearntwolanguagesaseasilyasonebecausetheyhear,rememberandspeaktwolanguageseveryday.Inschoolitisnotsoeasytolearnaforeignlanguagebecausethepupilshavesolittletimeforit,andtheyarebusywithothersubjects,too.Butyourmemorywillbecomebetterandbetterwhenyoudomoreandmoreexercises.51.Somepeoplecaneasilylearnmanythingsbyheartbecause_________.

52.Everybodylearnshismotherlanguage_________.

53.Beforeachildcanspeak,hemust_________.

54.Inschoolthepupilscan’tlearnaforeignlanguagewellbecause_________.

55.Yourmemorywillbecomebetterandbetter_________.

Anexpensivecarspeedingdownthemainstreetofasmalltownwassooncaughtupwithbyayoungmotorcyclepoliceman.Ashestartedtomakeouttheticket,thewomanbehindthewheelsaidproudly,“Beforeyougoanyfurther,youngman,Ithinkyoushouldknowthatthemayorofthiscityisagoodfriendofmine.”Theofficerdidnotsayaword,butkeptwriting.“IamalsoafriendofchiefofpoliceBarens,”continuedthewoman,gettingmuchmoreangryeachmoment,Stillhekeptonwriting.“Youngman,”shepersisted,“IknowJudgeLawsonandStateSenator(参议员)Patton.”Handingthetickettothewoman,theofficeraskedpleasantly,“Tellme,doyouknowBillBronson.”“Why,no,”sheanswered.“Well,thatisthemanyoushouldhaveknown,”hesaid,headingbacktohismotorcycle,“IamBillBronson.”56.Thepolicemanstoppedthecarbecause_____.

57.Thewomanwasgettingmoreangryeachmomentbecause_____.

58.Thepolicemanwas_______.

59.Thewomanwas_______.

某机场的飞行区等级为4E，则其中的数字是指（）。

一般来说，基尼系数越接近0，收入分配越公平。

下列函数公式中，平均函数是：()

要求通过while循环不断读入字符，当读入字母N时结束循环。若变量已正确定义，以下正确的程序段是

一个“工作簿"只能包含()

（）是通过资金等值换算将项目净现值分摊到寿命期内各年的等额年值。