任务二：除了文中提到的度暑假方式外，你一定会有自己的建议，请写一条与大家分享吧
5.{#blank#}5{#/blank#} 

A. It is very hard to break a code without the code book.

B. Only people who know the keyword can read the message.

C. As long as there have been codes, people have tried to break them.

D. You can hide a message by having the first letters of each word spell it out.

E. With a code book, you might write down words that would stand for other words.

F. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

    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. {#blank#}1{#/blank#}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. {#blank#}2{#/blank#}For example, the first letters of "My elephant eats too many eels" Spell out the hidden message "Meet me."

    {#blank#}3{#/blank#}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, 15, 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. {#blank#}4{#/blank#} For example, "bridge" might stand for "meet" and "out" might stand for "me." The message "bridge out" would actually mean "Meet me." {#blank#}5{#/blank#} However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

    Eleven countries are building a great wall of trees across Africa. It is called the Great Green Wall. The aim is to bring life to the dry lands and help to fight the bad environment.

    The wall is 8, 000 kilometers long and 15 kilometers wide. It covers from Senegal in the west to Djibouti in the east, on the south of the Sahara Desert (撒哈拉沙漠). So far, Senegal has made the best progress by planting about 11,000,000 trees.

    Many years ago, there were few trees in that area and the winds used to be very strong. It was harmful to the fields. Also, there was little rain, so few plants could grow and many people went hungry. Since the tree planting project started, the trees have provided food for the local people and increased the wetness (湿度) of the air. Little by little, there appeared green fields for people to grow plant.

    The project which began in 2007 is supposed to cost a total of 8, 000, 000, 000 dollars. Many countries are trying their best to help to continue the planting. So we will be able to see the whole green wall across Africa in the near future!

    A music club was set up in Class One, Grade Eight. The students who like music can join the club. There are some students in it now.

    Li lei likes rock music best. He says, "Rock music is my favorite, because it makes me happy and exited. It sounds exciting and most people like it. I am going to become a famous singer of a band when I grow up."

    Wang Ming says, "I am from the country. So I liked country music when I was young, and I still like it now. I will sing a song when I'm sad, and then I'll get better."

    The twins like jazz best because they can dance to the music.

    Jack says, "I like pop music, but I do well in playing musical instruments, so I like classical music best. I want to continue studying classical music."

    Han and Xue like folk music best, they say it sounds wonderful. They are ready for the next school concert.

Information Card

{#blank#}1{#/blank#}⑴Dave: It's cold now, but I only have an old sweater. I need new clothes.

{#blank#}2{#/blank#}⑵Jim: I like tennis but I don't know how to play it.

{#blank#}3{#/blank#}⑶Jane: I lost my watch at school.

{#blank#}4{#/blank#}⑷Jenny: I love dogs. I want to have a dog.

{#blank#}5{#/blank#}⑸Peter: I like watching basketball game.

In an art studio in Wuhan, Hubei province, a delivery worker busily packed 1,500 original Chinese ink drawings and works. {#blank#}1{#/blank#} He hadn't left his studio for two weeks.

But these works represented only a part of Rong's large project to say thanks to the medical workers who helped Wuhan defeat COVID-19. They are the most recent batch of art in a project, which he will spend three years completing

{#blank#}2{#/blank#} He sent them around the country to thank the medical workers.

Rong draws cows and mice with the Chinese characters "shi shu bu yi" (meaning not easy) and "niu zhuan qian kun" (meaning to bring about big changes). "I want to express my thanks to the medical workers who helped Wuhan last year," Rong said. "{#blank#}3{#/blank#}Wuhan could not have recovered so soon without their sacrifice and hard work."

The artworks include beautiful postcards, notebooks and stamps. Some of Rong's works were donated to the National Museum, local museums and art centers to add to their collections. {#blank#}4{#/blank#}

To show support for Rong, a large delivery company, BEST, contacted him to say they were willing to deliver the works free of charge.

"{#blank#}5{#/blank#}" said Wu Guojie, manager of BEST's Hubei branch.

A. Since Spring Festival last year, he has produced more than 8,500 drawings.

B. They were all produced by Rong Zhengmao, a national senior artist.

C. We hope to use this chance to express our thanks along with Mr. Rong,

D. Around 7,000 pieces were sent last year at a cost of about 30,000 yuan.

E. Many of them came from faraway places, including Xinjiang and Heilongjiang