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WARNING: Holding a cell phone against your ear or putting it in your pocket may be bad for your health.   

This sentence is a warning that you’d better not put it close to you when a new phone is bought. Apple company, for example, doesn't want IPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry's producer, recommends 2.5 centimeters.

(1)If cell phone use can        health problems, the         will be very serious. Americans spend 2.26 trillion minutes chatting on cell phones every year, which brings $109 billion for the wireless businessmen.

Devra Davis, an epidemiologist(皮膚病專家) who has worked for the University of Pittsburgh, has published a book about mobile phone radiation（輻射）"Disconnect." Davis studies how often brain cancer happens during different age groups. She finds a big increase in brain cancer in the 20-to-29 age group and a drop for the older people.

Children are more easily hurt by radiation than grown-ups, Ms. Davis and other scientists point out. But no studies have yet been finished on cell phone radiation and children, she says.

Henry Lai, a research professor, began lab radiation studies in 1980 and found that mice exposed to(暴露在) radiofrequency（電波頻率）radiation had destroyed DNA in their brains.

Ms. Davis recommends using wired earphones（有線耳機）or the phone's speaker. (2)Children should send text messages rather than call, she said, and pregnant（懷孕的） women should keep phones away from their bodies.

1.在（1）句空白處填入適當的詞使句意完整、上下文通順。

2.將（2）句翻譯成中文。

3.回答問題：What kind of people with brain cancer are getting more and more?

4.找出同義句。

Scientists are still carrying on with the studies on cell phone radiation and children

5.找出或寫出該短文的主題句。