题型:阅读选择 题类: 难易度:普通
江苏省扬州市宝应县2023-2024学年八年级下学期期末考试英语试卷
How to write a secret message Do you want to write a message that can only be read by a person? It is a secret message for that person only. The other people can't see the message on the paper. Only that person knows how to make the message appear. Here's an experiment(实验)on how to write such a message. You'll need *half a lemon *a cup *four spoons of water *a cotton swab(棉签) *white paper *a light bulb(电灯泡) What to do 1. Squeeze(挤)some lemon juice into water. Mix the water and juice 2. Put the cotton swab into the mixture(混合物)and make it wet. Use the wet cotton swab to write some words on the paper. 3. Let the paper dry. Show it to someone and ask if he or she can see the words on the paper. 4. Hold the paper close to a light bulb to heat it. Ask him or her again. Let me explain it! Lemon juice has chemicals that have carbon(碳). The chemicals break down easily when they are heated(加热). And the carbon makes them turn into a dark color. |
a. Use a lightbulb to heat the paper
b. Put a cotton swab into the mixture.
e. Mix lemon juice and water
d. Write some words on a piece of white paper with the wet cotton swab.
e. Dry the paper.
Name | Age | From | Favourite colour | Favourite sport |
Sally | 11 | London, England | Red | Volleyball |
Peter | 12 | New York, America | Yellow | Football |
Tang Lei | 13 | Shenyang, China | Blue | Tennis |
Wang Hui | 14 | Guangzhou, China | Red | Basketball |
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