通讀下面的短文，掌握其大意。從每小題的四個選項中選出可填入相應(yīng)空白處的最佳選擇，并把它前面的大寫字母填入左邊括號里。

　　If we were asked exactly what we were doing a year ago， we should probably have to say that we could not remember. But if we had kept a book and written in it an account of _31_ each day， we should be able to give an answer _32_ the question.

　　It is the same in the history. _33_ have been forgotten because we do not have any written account of them. Sometimes men _34_ a record of the important happenings in _35_ country， _36_ often it was destroyed by fire or in a war. Sometimes there was never any written record at all because the people _37_ did not know how to write. For example， we know _38_ the people who lived in China 4，000 years ago， because they could write and _39_ written records for these who live _40_ them. But we know _41_ nothing about the people who lived even 200 years ago in Central Africa， because they _42_.

　　Sometimes， of course， even if the people cannot write， they may know something of the past. They have learned about it from _43_ people， and often songs and dances and stories have been made about the most important happenings， and these have been sung and acted and told _44_ many generations (後代)。 Most people are proud to tell _45_ their fathers did in the past. This we may call “remembered history”。 _46_ has now been written down. It is not so exact _47_ so valuable to us _48_ written history is， because words are much more easily _49_ when used again and again in speech than copied in writing. But _50_ no written records， such spoken stories are often very helpful.

　　( )31.A. what to do B. what we did C. how to do D. how we did

　　( )32.A. for B. in C. on D. to

　　( )33.A. all things B. Many things C. More D. Much

　　( )34.A. did keep B. should keep C. would keep D. were keeping

　　( )35.A. our B. your C. their D. his

　　( )36.A. still B. but C. even D. or

　　( )37.A. when and where B. of when and where

　　C. that time and place D. of that time and place

　　( )38.A. a good deal about B. a lot of about

　　C. many D. much

　　( )39.A. left B. gave C. leave D. send

　　( )40.A. before B. after C. later D. for

　　( )41.A. almost B. most C. at most D. mostly

　　( )42.A. have not learned to write B. have learned to write

　　C. had learned how to write D. had not learned to write

　　( )43.A. older B. the oldest C. outside D. most

　　( )44.A. by B. about C. for D. within

　　( )45.A. how B. which C. that D. what

　　( )46.A. Some of it B. Some of them C. All of it D. Many of them

　　( )47.A. and B. or C. yet D. even

　　( )48.A. as B. that C. such D. so

　　( )49.A. moved B. forgotten C. recited D. changed

　　( )50.A. where B. there

　　C. where there are D. where they are

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