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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?
B instead of C, and so on. His message to Sam shown on the right was very short. Can you understand?
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 go to the ______. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| A.park B.house C.museum D.zoo | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2.Sam told David to meet him ______. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| A.before breakfast B.after school C.after dinner D.before school | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3.Codes are used to keep something ______. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| A.new B.old C.secret D.known | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4.People will never know the meaning if they can't ______ the code. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| A.break B.make C.change D.write | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5.The best title of this passage is . | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| A.English Letters B.Codes C.Messages D.Machines |
Mike: Good morning , Tom, How are you?
Tom: 1.F_______, thank you . And you?
Mike: I'm fine, too. Is this your 2. p______?
Tom: Yes, it's 3.m_____ pencil.
Mike: 4.W_____ this in English?
Tom: It's 5. a_____ old book.
Mike: And what's this?
Tom: It's a 6. d_____
Mike: How do you 7.s_____ it?
Tom: D-I-C-T-I-O-N-A-R-Y.
Mike: Is it an 8.E_____ dictionary?
Tom: No, it's a 9.C_____ dictionary.
Mike:Very good. Oh, it's time to go home. 10.G_____.
Tom: Bye-bye.
Now students' English handwriting(书法)gets worse and worse. That makes their teachers feel worried. Is your English handwriting beautiful? If n 【小题1】, here are four steps that really work!
Use paper with lines
Using paper with lines can keep you writing straight i 【小题2】 of up or down when you write English words or sentences. Those lines on the paper can help you to write words in the right size. Be s 【小题3】 to fill the lined space completely. And make sure those capital letters(大写字母) are written properly.
Slow down
If your writing is hard to read, try slowing down a little. For some kids, going slower makes the handwriting clear. If you write too q 【小题4】, it's hard for you to stop where you should, and even worse, you may make more m 【小题5】.
Hold your pencil right
When you hold your pencil the correct way, writing is much e 【小题6】. Some kids press down really hard when they write. That makes the handwriting not nice. Try to be relaxed and don't hold the pencil so hard. Let your writing appear nice and clean. If you do so, people will guess you are a student w 【小题7】 a good habit.
Draw more pictures
Drawing can improve your handwriting. You need to use the skills to control your pencil better w 【小题8】 you are drawing pictures. Even though you have no chance to draw at school, you can practice by y 【小题9】 at home.
Handwriting is very important. Imagine you are a world-famous movie star or a well-known sports player, what do you do when your f 【小题10】 run up to you? Give them your autographs(亲笔签名), of course!
Now students' English handwriting(书法)gets worse and worse. That makes their teachers feel worried. Is your English handwriting beautiful? If n 1., here are four steps that really work!
Use paper with lines
Using paper with lines can keep you writing straight i 2. of up or down when you write English words or sentences. Those lines on the paper can help you to write words in the right size. Be s 3. to fill the lined space completely. And make sure those capital letters(大写字母) are written properly.
Slow down
If your writing is hard to read, try slowing down a little. For some kids, going slower makes the handwriting clear. If you write too q 4., it's hard for you to stop where you should, and even worse, you may make more m 5..
Hold your pencil right
When you hold your pencil the correct way, writing is much e 6.. Some kids press down really hard when they write. That makes the handwriting not nice. Try to be relaxed and don't hold the pencil so hard. Let your writing appear nice and clean. If you do so, people will guess you are a student w 7. a good habit.
Draw more pictures
Drawing can improve your handwriting. You need to use the skills to control your pencil better w 8. you are drawing pictures. Even though you have no chance to draw at school, you can practice by y 9. at home.
Handwriting is very important. Imagine you are a world-famous movie star or a well-known sports player, what do you do when your f 10. run up to you? Give them your autographs(亲笔签名), of course!
查看习题详情和答案>>
Use paper with lines
Using paper with lines can keep you writing straight i 小题2: of up or down when you write English words or sentences. Those lines on the paper can help you to write words in the right size. Be s 小题3: to fill the lined space completely. And make sure those capital letters(大写字母) are written properly.
Slow down
If your writing is hard to read, try slowing down a little. For some kids, going slower makes the handwriting clear. If you write too q 小题4:, it's hard for you to stop where you should, and even worse, you may make more m 小题5:.
Hold your pencil right
When you hold your pencil the correct way, writing is much e 小题6:. Some kids press down really hard when they write. That makes the handwriting not nice. Try to be relaxed and don't hold the pencil so hard. Let your writing appear nice and clean. If you do so, people will guess you are a student w 小题7: a good habit.
Draw more pictures
Drawing can improve your handwriting. You need to use the skills to control your pencil better w 小题8: you are drawing pictures. Even though you have no chance to draw at school, you can practice by y 小题9: at home.
Handwriting is very important. Imagine you are a world-famous movie star or a well-known sports player, what do you do when your f 小题10: run up to you? Give them your autographs(亲笔签名), of course!