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nganle210103
1 năm trước
Cho phương trình bậc hai ẩn số x : x^2 - 4x - m^2 - 1 = 0 Chứng minh phương trình 1 luôn có giá trị với mọi m mọi người ơi giúp mình với
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Not so long ago, people only used the telephone to make phone calls. Now, thanks to computers, people use their phones to do much more. They can bank by phone, rent videos by phone, and even shop by phone. It is also possible to send letters and reports be faxing them over telephone lines. People can even use their phone lines to send messages from one computer to another computer by electric mail, or e- mail. But you don’t need to be at home or at the office to use the phone anymore. You can carry a cellular phone in your pocket or keep one in your car. With a cellular phone , anyone who can talk and walk can also phone and walk. You don’t have to look for a pay phone to make a call anymore. Now you can take your calls with you everywhere. 1. The main topic of the passage is …………….. A. current use of telephones B. the use of a cellular phone C. the convenience of the cellular phone D. the use of a telephone in the past 2. People didn’t use to………………….. A. shop by phone B. make phone calls only in the office C. make phone calls only at home D. make only phone calls with the telephone 3. These are these advantages of having a cell phone EXCEPT for A. You can carry it in your pocket B. You have to use a pay phone to make a call C. You can keep it in your car D. with it, you can phone and walk. 4. With a cellular phone you can………………………. A. only carry it in your pocket B. only keep it in your car. C. make a phone call everywhere you want D. only take photos 5. The word “pay phone” means…………………… A. the phone pays you B. you can phone free of charge C. you don’t pay for the call D. you pay for the call

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