Secret codes (密码) keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.
People have used secret codes for thousands of years. 1.Code breaking never lags (落后) far behind code making. The science of creating and reading coded messages is called cryptography.
There are three main types of cryptography. 2.For example, the first letters of “My elephant eats too many eels” spell out the hidden message “Meet me.”
3.You might represent each letter with a number, for example. Let’s number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message “Meet me” would read “13 5 5 20 13 5.”
A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 4.For example, “bridge” might stand for “meet” and “out” might stand for “me.” The message “Bridge out” would actually mean “Meet me.” 5.However, it is also hard to keep a code book secret for long. So codes must be changed frequently.
A. It is very hard to break a code without the code book.
B. In any language, some letters are used more than others.
C. Only people who know the keyword can read the message.
D. As long as there have been codes, people have tried to break them.
E. You can hide a message by having the first letters of each word spell it out.
F. With a code book, you might write down words that would stand for other words.
G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.
你的美国笔友John得知武汉因为新冠病毒引起的肺炎封城，学校不能如期开学，想知道你们现在在家如何学习。请你写一封回信。内容包括: 1.学习内容和方式；2.锻炼方式； 3.感想。
参考词汇： the novel coronavirus新型冠状病毒; pneumonia 肺炎; lockdown n.封城; quarantine隔离
注意：
1. 词数120左右；
2. 可以适当增加细节，以使行文连贯。
Dear John,
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours,
LiHua
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
注意：1. 每处错误及其修改均仅限一词:
2. 只允许修改10处，多者(从第11处起)不计分。
Welcome to the Great Wall. Measured more than 6,000 kilometers in length, the Great Wall is known as the long wall in the world. It had a long history of more than 2,000 years. That is amazing about the Great Wall is that it is main made of stones and bricks, and that all the construction was done by hand. As it was used to protecting the country from foreign invaders, every a few hundred meters along the Great Wall, there was a watchtower. Now, as a symbol of China, the Great Wall has become one of the most famous tourist attraction in the world. There is no wonder that the Great Wall attracts thousands foreign tourists every year.
阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
Workers in India are moving over 300 crocodiles from their home because they are too near a new tourist sight. They could be a danger to tourists 1. (visit) the new Statue of Unity which was opened to the public recently. It is 182 meters high and is the 2. (tall) statue in the world. It is next to a reservoir, which is also home to many crocodiles. Tourism officials want to have the crocodiles 3. (move) so seaplanes for tourists can land on4.reservoir. If the crocodiles stayed, they could be dangerous and attack tourists. Officials are using 5. (cage)to catch the animals. They are going to a new home in another part of Gujarat.
Animal lovers are angry about the moving. One said, “The government is disturbing their home and putting their lives 6.risk. The government hasn't thought out where it will set free the seized crocodiles safely.” So far, only 17 of the animals 7. (catch)and moved. Another said, “Have we collectively lost our minds? 8. any environmentalist will tell you, this is 9.(complete) crazy.” Moving the crocodiles could break India's wildlife protection laws. An official said the crocodiles had to go for “10. (secure) reasons”.
Steve was a seventh grader, a big boy, looking more like a teenager than a 12-year-old. Yet, he went unnoticed — he had been ____ every examination since first grade—until Miss Wilma.
In the middle of the first semester of school, the entire seventh grade was ____ for basic skills.
“You all did pretty well,” Miss Wilma told the class after going over the ____, “except for one boy. And it _____my heart to tell you this, but…” she ___ , “the smartest boy in the seventh grade is failing my class.” Steve ____ his eyes and carefully examined his fingertips.
After that, Steve still wouldn’t do his homework. Even if Miss Wilma ____punished him, he remained ___ .
“Steve, please! I care about you!”
____, Steve got it! “Someone CARES ABOUT ME?!”
One Monday a couple of weeks later, Miss Wilma gave a ____ on the weekend homework. Steve ____ through the test and was the first to hand in his paper. With a look of ____, Miss Wilma took his paper and began to look it over.
Miss Wilma’s face was in ____ shock! She glanced up at Steve, then ____, then up. The smartest boy in the seventh grade had just passed his first test!
From that moment, nothing was the same for Steve. He discovered that not only could he remember and understand_____, but he could translate what he learned into his life. He became______.
After high school, Steve enlisted in the Navy, and he had a(n)_____military career. During his naval years, he inspired many young people who might not have _____themselves without him.
A _____took place within the heart of a boy all because of one teacher, who ____.
1.A.missing B.failing C.passing D.skipping
2.A.tested B.classified C.separated D.reflected
3.A.questions B.effects C.lessons D.results
4.A.fills B.presses C.breaks D.destroys
5.A.stopped B.hesitated C.interrupted D.shouted
6.A.dropped B.raised C.covered D.closed
7.A.strangely B.steadily C.severely D.secretly
8.A.helpless B.stubborn C.flexible D.clumsy
9.A.Commonly B.Unwillingly C.Particularly D.Suddenly
10.A.quiz B.chance C.speech D.presentation
11.A.slept B.looked C.lived D.hurried
12.A.disappointment B.surprise C.satisfaction D.encouragement
13.A.adequate B.total C.precious D.absurd
14.A.down B.away C.out D.back
15.A.homework B.grades C.knowledge D.subjects
16.A.talented B.lazy C.outstanding D.rough
17.A.tiring B.ordinary C.hardworking D.successful
18.A.relied on B.looked after C.turned to D.believed in
19.A.competition B.choice C.change D.campaign
20.A.waited B.listened C.desired D.cared
Do you think you’ve lost your inspiration? Maybe the ups and downs of life and work have affected you. You're not alone. The majority of people across the world are trying newer and easier ways to get inspired. 1.They start thinking to themselves that they are no good. And only a handful of people can stay inspired for life. You can get inspired for life anytime you want. That's the potential of being human.
Alone time is just as important as socializing time. It is important to stay alone for you to understand your thoughts and emotions at a deeper level. 2.It's always inside of you, waiting to be used.
Do you have goals? If you don't, now is the time to write them down. A person without goals has no direction. And he or she can never know if he or she is making progress or not. Create your life goals and then break them down to yearly goals, monthly goals, weekly goals and daily goals, You can even go deeper to hourly goals.3.
When socializing, listen to the stories of other people, You’ll be happy to realize how fortunate you really are. Most of the people around you have gone through things you might never imagine. 4. Listen to their stories and how they settled their problems. You can also read an inspiring book or watch a movie to get the inspiration you need to move forward.
5. If you’re lost your inspiration, you can put to practice these tips any time. It's time to start living with passion.
A. Inspiration comes from inside.
B. Inspiration also comes from your success.
C. But they give up along the way gradually.
D. And there they are standing in front of you.
E. Everyone needs inspiration to succeed in life.
F. But they always keep their experiences a secret.
G. Having a sense of direction will keep you inspired.
