Question

Holding a cell phone against your ear or storing it in your pocket may be dangerous to your health. This explains a warning that cell phone makers include in the small print that is often ignored when a new phone is purchased. Apple, for example, doesn’t want iPhones to come closer to you than 1.5 centimeters.

If health issues arise from cell phone use, the possible effects are huge. According to Devra Davis, an expert who has worked for the University of Pittsburgh, brain cancer is a concern. Over all, there has not been an increase in its occurrence since cell phones arrived. But the average masks an increase in brain cancer in the 20-29 age group and a drop for the older population.

“Most cancers have many causes,” she says, but she points to laboratory research that suggests low-energy radiation could damage cells that could possibly lead to cancer.

Children are more vulnerable to radiation than adults, Ms. Davis and other scientists point out. Radiation that penetrates (穿透) only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls (头骨) are thinner and their brains contain more absorptive fluid.

Henry Lai, a research professor in the bioengineering department at the University of Washington, began laboratory radiation studies in 1980 and found that rats exposed to radiation had damaged DNA in their brains.

Ms. Davis recommends using wired headsets or the phone’s speaker. Children should text rather than call, she said, and pregnant women should keep phones away from the belly.

1.According to Ms Davis, brain cancer increases ________.

A. in the teenagers       B. among old people

C. in the twenties       D. among pregnant women

2.What does the underlined word “vulnerable” in the 4^th paragraph probably mean?

A. accessible      B. changeable

C. passive         D. sensitive

3. The author’s purpose of writing the text is most likely to ________.

A. entertain               B. persuade

C. describe                D. inform

4.Which of the following would be the best title for the passage?

A. Low-energy Radiation Leads to Cancer

B. Cell Phone Use Brings Health Problems

C. Radiation Damages DNA in People’s Brain

D. Researchers Launched Lab Studies on Cell Phones

Answer

1.C

2.D

3.D

4.B

【解析】

试题分析：本文讲述的是使用手机会带来辐射的负影响，警示人们要正确使用手机。

1.

2.

3.D推理判断题。本文主要介绍使用手机的负作用，最后警示人们要正确使用手机。可知作者写这篇文章的目的是：警示人们要正确使用手机。故选D。

4.B主旨大意题。本文主要介绍使用手机的负作用，最后警示人们要正确使用手机。因此A项更能说明全文的主旨，而其它三项只是文中的细节内容，故选A项。

【名师点评】本文讲述的是使用手机会带来辐射的负影响，因此需要正确使用手机。文章基本上是考查细节题，对此类题型考生可以首先从问题中找到关键词，然后以此为线索，运用略读及查阅的技巧在文中迅速寻找这一细节，找到后再把这一部分内容仔细阅读一遍，仔细比较所给选项与文中细节的细微区别，在准确理解细节的前提下，最后确定最佳答案。

考点：考查说明文阅读