Weeachhaveamemory.That’swhywecanstillrememberthingsafteralongtime.Somepeoplehaveverygoodmemoriesandtheycaneasilylearnmanythingsbyheart,butsomepeoplecanonlyrememberthingswhentheysayordothemagainandagain.Manyofthegreatmenoftheworldhavegotsurprisingmemories.Agoodmemoryisagreathelpinlearningalanguage.Everybodylearnshismotherlanguagewhenheisasmallchild.Hehearsthesounds,remembersthemandthenhelearnsspeak.Somechildrenarelivingwiththeirparentsinforeigncountries.Theycanlearntwolanguagesaseasilyasonebecausetheyhear,rememberandspeaktwolanguageseveryday.Inschoolitisnotsoeasytolearnaforeignlanguagebecausethepupilshavesolittletimeforit,andtheyarebusywithothersubjects,too.Butyourmemorywillbecomebetterandbetterwhenyoudomoreandmoreexercises.51.Somepeoplecaneasilylearnmanythingsbyheartbecause_________.
A
they read a lot of books
B
they often eat good food
C
they always sleep very well
D
they have very good memories
