B. People should use cell phones in the correct way.

　　C. If you are a child, you’d better text than make phone calls.

　　D. When you use a cell phone, use a wired headset or the phone’s speaker.

　　15. What does the passage mainly talk about?

　　A. Be careful when using cell phones.

　　B. Don’t hold your cell phone against your ear.

　　C. Rats exposed to radiation have damaged DNA in their brains.

　　D. Low-energy radiation could damage cells that could lead to cancer.

　　E

　　Africa is a very diverse land with many different tribes. One tradition that many of these groups share is painting or marking their bodies and faces in color. They do this for many reasons. Some marks are used to identify people as part of a group.___ 16___ Let’s look at some different examples of body painting.

　　___17____ Among the Masai of East Africa, when men are old enough to marry and make decisions for their people, they participate in a special ceremony in which they paint their heads and faces red. This ceremony take place every seven to fourteen years, so there is not an exact age for participating in it. The Samburu, also from East Africa, like to paint their faces and hair red because they think it looks attractive.

　　___18____ To show that he has killed a lion, a man will paint his body with a natural white material, making special marks to represent this accomplishment. The Masai men also use this white to show that they are on longer boys and are considered adults.

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