It is widely agreed that the brain is one of (6) ______ most important parts of the body. Its main function (功能) is to store (储存) information. This ability is called memory. (7)________ good memory means a lot, (8) ________ how do people have a good memory? First, enough sleep would be very (9) ________ (help). The scientists find out if you are lacking in sleep for a long time, your memory will slow down (10) ________ (quick). Second, try to relax (11)________ (you) regularly (定期地). Think about the happy things, (12) _______ this will keep you away from all the terrible (13) ________ (memory). If they are all gone, you can easily pay attention to your study. At last, the memorizing methods also play (14) _______ important role in memorizing (15) _______ (thing). If you often see a thing, you can keep it in your long-term memory.

　　参考答案：

　　6. the 7. A 8. but 9. Helpful 10. quickly 11 . yourself　12. and 13. memories 14. an 15. things