C. They think people will not care about it.
D. The warning is not important at all.
67. According to Ms Davis, brain cancer increase ____.
A. among children
B. among old people
C. in the twenties
D. among pregnant women
68. 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.
69. What can we conclude from the last paragraph?
A. Pregnant women should keep cell phones away.
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.
70. 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.
语篇解读:使用手机会带来辐射的负影响,因此需要正确使用手机。
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