《2025年优加学案课时通八年级英语下册冀教版》

【拓展练习】
21. Why did computers become very important?
______________________________
22. 新考向·开放性问答 Do you want to have a computer? Why or why not?
______________________________

答案： 21. Because they can work faster than man and make fewer mistakes.
22. Yes, I do. Because it can help me a lot.（答案不唯一）

Ⅳ.阅读表达
Nowadays, people use computers to do a lot of things every day, like searching for information and sending e-mails. But none of them would go well without the computer mouse.
The first computer mouse appeared in 1964, invented by Douglas Engelbart. It was mainly made up of a wooden "house", a circuit (电路) board and two metal wheels. Engelbart called his invention the "Bug". But the long "tail" on the back made it look like a mouse, so the name became well - known soon.
Eight years later, Bill English, an American computer engineer, developed the mouse further. He changed the wheels into a rolling (滚动的) ball at the bottom of the mouse. The "Ball Mouse" was easier to use and could be found in lots of offices. It had its problems, though. For example, the ball became dirty easily from rolling round the desktop. The dirt had to be often cleaned out to keep the ball running well.
The disadvantages led to the next development around 1980. Then the optical mouse(光学鼠标) was invented. However, the optical mouse wasn't widely used because it was too expensive.
The computer mouse has come a long way since its invention. It has been improved many times to meet the changing needs of users. But with the rise of touch screens and voice control, some experts think the computer mouse may disappear in the future. However, some people think it will still have a market.
23～27题简略回答问题。
23. When did the first computer mouse come out?
______________________________
24. How did Bill English improve the mouse?
______________________________
25. What was the problem with the "Ball Mouse"?
______________________________
26. Why wasn't the optical mouse widely used?
______________________________
27. 新考向·开放性问答 Do you think the mouse will disappear in the future? Why or why not?
______________________________

答案： 23. In 1964.
24. By changing the wheels into a rolling ball at the bottom of the mouse.
25. The ball became dirty easily from rolling round the desktop and the dirt had to be often cleaned out to keep the ball running well.
26. Because it was too expensive.
27. Yes. Because of the rise of touch screens and voice control technology.（合理即可）