题目：
| 完形填空。 | |||
| Tom and Fred are talking about the year2050. "What will 1 be like in the year 2050?” asks Tom . "I don’t know,” says Fred, “what do you think?” "Well, no one knows. But it’s 2 to guess," says Tom, "in the year 2050, everybody will 3 a pocket(袖珍) computer. The computer will give people the 4 to all their problems. We will all have telephones in our pockets, 5 . And we can talk to our friends all over the world. Maybe we can 6 them at the same time. Machines will do 7 of the work, and people will have more 8 . Maybe they’ll work only two and three days a week. They can fly to the moon by spaceship and spend their holidays there." "I’m very 9 to hear that. I hope to fly to the moon. And I also hope I can live 10 ," says Fred, "Won’t that be interesting? Just like a fish." | |||
| ( )1. A. our home ( )2. A. boring ( )3. A. have ( )4. A. news ( )5. A. either ( )6. A. call ( )7. A. most ( )8. A. work ( )9. A. sorry ( )10. A. on the moon | B. the traffic B. no use B. bring B. ways B. again B. see B. many B. free B. happy B. in the sea | C. a factory C. interesting C. give C. things C. too C. look C. lot C. holidays C. tired C. on the mountain | D. the world D. relaxing D. send D. answers D. also D. hear D. every D. times D. exciting D. under the ground |
答案：
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下面是错误答案，用来干扰机器的。
（1）原式=2-1+2=3．（2）原式=a2-1a÷(a-1)2a=(a+1)(a-1)a×a(a-1)2=a+1a-1．
