估算：
|
275×34，
≈300×30，
=9000；
902×58，
≈900×60，
=54000；
720×45，
≈700×50，
=35000；
781×59，
≈800×60，
=48000；
945×37，
≈900×40，
=36000；
600×89，
≈600×90，
=54000；
474×18，
≈500×20，
=10000；
270×49，
≈300×50，
=15000．
故答案为；900，54000，35000，48000，36000，54000，10000，15000．
| 阅读理解。 | ||||||
Take a look at our library! Our library is open to everyone and the library card is free.
| ||||||
| 1. The books in the library were published (出版) in ______ languages. | ||||||
| A. 26 B. 36 C. 42 D. 50 | ||||||
| 2. What can you enjoy in the reading room? | ||||||
| A. Magazines. B. Language cassettes. C. Video films. D. CDs. | ||||||
| 3. How much should you pay if you keep three videos for a week? | ||||||
| A. 1 yuan. B. 2 yuan. C. 3 yuan. D. Nothing. | ||||||
| 4. How long can you keep one cassette at a time? | ||||||
| A. One day. B. One week. C. Two weeks. D. Three weeks. | ||||||
| 5. Which of the following is true according to the form? | ||||||
| A. The library card will cost you one yuan. B. You can borrow as many CDs as you like at a time. C. You can keep five books at a time for three weeks. D. There aren't any rooms for you to enjoy music videos in the library. |