()17.What is the major characteristic of man's memory capacity according to the author?A. It can be expanded by language.

　　B. It can remember all the combined words.

　　C. It may keep all the information in the past.

　　D. It may change what has been stored in it.

　　()18.Human________．nize faces and places on sight

　　D. having the ability to draw on past experiences

　　三、根据短文内容从短文后 Computers give off radiation that is bad for your health, but here are some ways to protect yourself from computer radiation.

　　19．______Green tea can be absorbed by the body easily into a form of vitamin A, which helps reduce radiation. 20.______

　　It is advisable to attach a radiation filter plate(辐射过滤板)in front of your computer's screen.Make sure to avoid putting any mental substances near your computer as these may have reflected some of the electromagnetic waves that are harmful to your health. 21.______The brighter the screen the higher the radiation there will be and vice versa.

　　You can also put some radiation－absorbing plants such as several cacti near your computer to prevent radiation.uter. 22.______Wash your face soon after using the computer in order to reduce 70% of the radiation.

　　23．______ Old computer in general, has one to two times more radiation released than the new one within the same distance.

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