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Remember books? The paper kind. With pages. In the old days before computers, to get information, people read books and newspapers. Students spent hours and hours in the library, looking for information in the old books for homework. Now students can find anything on the internet in seconds. The library was a place where everyone was quiet. Sing along to music? Never! Watch a movie on phone while they are reading? Impossible! But now students can watch videos about their research topic as they write a paper.
Before computers, articles were handwritten. If a student made a mistake, he would throw the paper away and start writing all over again. Now? If a student makes a mistake, he can just remove or cut it. Students type on their computers and edit （编辑）freely. But they should save their writing in time on the computer because it may stop working suddenly. Who wants to lose his hard work forever?
Communication online is easy and fun. While students are writing, they can discuss with friends in another window. Did you think they were chatting （聊天）with someone in the real same room? No! They're chatting with everyone in their own room.
Technology helps us get important information in no time. In areas where bad weather is a problem, we can get warnings from our phone. Our local radio or TV station can give information about where to get help or what to do to keep our family and home safe.
Technology is our friend!
1题完成句子；2、3题简略回答问题；4题找出并写下第四段的主题句；5题将文中画线句子译成汉语。
1．In the old days before computers, people
2．How can a student correct his mistake while writing on the computer?
3．Why should students save their writing in time on the computer?
4．
5．
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
