题型:任务型阅读 题类:模拟题 难易度:普通
浙江省杭州市翠苑中学2018年英语中考二模试卷
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. 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. For example, the first letters of "My elephant eats too many eels" Spell out the hidden message "Meet me."
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. For example, "bridge" might stand for "meet" and "out" might stand for "me." The message "bridge out" would actually mean "Meet me." However, it is also hard to keep a code book secret for long. So codes must be changed frequently.
Last week, I had a great vacation to Hainan with my family. We had great fun playing in different places. On Monday, the weather was sunny and hot. We went to White Beach and swam in the water. On Tuesday, it was cloudy. We visited two museums. We saw a lot of things. On Wednesday and Thursday, It was rainy and windy. We walked around the city. We bought interesting things and ate some delicious food. On Friday, the weather was cool. We climbed mountains. We were very tired but felt very happy. I really enjoyed my vacation.
When |
Where |
Weather |
Activity |
Monday |
White Beach |
sunny and hot |
{#blank#}1{#/blank#}in the water |
Tuesday |
museums |
{#blank#}2{#/blank#} |
Visit two museums |
{#blank#}3{#/blank#}and Thursday |
city |
rainy and windy |
walk around the city and eat some nice{#blank#}4{#/blank#} |
Friday |
{#blank#}5{#/blank#} |
cool |
climb mountains |
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