摘要: 6:16 10. 8:50 V. 单项选择

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  David’s got a text message from his friend Sam.Can you understand it?

  7,15  20,15  20,8,5  16,1,18,11

  This message was in code(密码,代码).How many letters are there in the English alphabet?Twenty-six.So can you read it now?

  David decided to use a different code in his answer to Sam.This time, he was putting A instead of B, B instead of C, and so on.His message to Sam shown on the right was very short.Can you understand?

  Sam guessed David’s code, and he replied:ZESDQ RBGNNK.When David’s little sister saw the message, she felt puzzled.She couldn’t read it at all.But David was very happy that his sister couldn’t read his message!

  Lots of people use codes to send secret messages.In a war, secrets are very important so soldiers often send each other messages in code.Nowadays, we can use computers to make and break difficult codes.Even before computers, people invented other machines to do this.

  Here’s a famous machine that Germans used in the Second World War(1941-1945).It’s called the Enigma Machine.The machines were very big, heavy and expensive.Every day they changed the codes automatically, and this made it almost impossible for anyone to break the codes.The person sending a message had one machine, and the person receiving the message had another.

(1)

Sam asked David to the ________.

[  ]

A.

park

B.

house

C.

museum

D.

zoo

(2)

Sam told David to meet him ________.

[  ]

A.

before breakfast

B.

after school

C.

after dinner

D.

before school

(3)

Codes are used to keep something ________.

[  ]

A.

new

B.

old

C.

secret

D.

known

(4)

People will never know the meaning if they can’t ________ the code.

[  ]

A.

break

B.

make

C.

change

D.

write

(5)

The best title of this passage is ________.

[  ]

A.

English Letters

B.

Codes

C.

Messages

D.

Machines

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As everyone knows, there are many  16  of transportation in the world, like bicycles, buses, ships, trains and  17  .
If you are in big  18 like Shanghai or Beijing, maybe you get to school   19  a subway or you have to  20  to school because you live in a mountain village. Here I am just trying to say something about 21  .
Ten years 22 , bicycles were very 23 in most villages.  24  family had one or two of bicycles. Children got to school by bicycle;  25  rode bicycles to go shopping. Then motorcycles (摩托车)   26  to become popular. People no longer rode bicycles because motorcycles ran   27  faster.  But now, in some countries,bicycles are highly suggested
  28  the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles   29  . So, to live a low-carbon life,   30  a bike is a good way.

【小题1】
A.kindB.kindsC.meanD.way
【小题2】
A.otherB.othersC.the otherD.another
【小题3】
A.citiesB.countriesC.villagesD.countryside
【小题4】
A.onB.byC.inD.of
【小题5】
A.on footB.walkC.walksD.runs
【小题6】
A.bicyclesB.motorcyclesC.busesD.cars
【小题7】
A.laterB.beforeC.agoD.after
【小题8】
A.cheapB.importantC.expensiveD.popular
【小题9】
A.AllB.BothC.Every D.Most
【小题10】
A.womenB.boyC.womanD.girl
【小题11】
A.beginB.beganC.begunD.start
【小题12】
A.moreB.muchC.lessD.most
【小题13】
A.forB.inC.atD.as
【小题14】
A.notB.don’tC.doesn’t D.didn’t
【小题15】
A.ridingB.ridesC.rode D.ride

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