“Most cancers have multiple 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(易受伤的to radiation than adults, Ms. Davis and other scientists point out. Radiation that penetrates only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains contain more absorptive fluid(易吸收的液体No studies have yet been completed on cell phone radiation and children, she says.

　　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 abdomen(腹部. Why do children easily be affected by radiation?

　　A. Because they haven’t grown up.

　　B. Because they are too young to protect themselves.

　　C. Because they use cell phones more often than adults.

　　D. Because their skulls are thinner and their brains are easily hurt.

　　14. What can we conclude from the last paragraph?

　　A. Pregnant women should keep cell phones away.

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