题目内容：
Why are mobiles so popular? Because people love to talk to each other. And it is easier with a mobile phone. In countries like Russia and China, people use mobile phone in places where there is no ordinary telephone. Business people use mobiles when they’re traveling. In some countries, like Japan, many people use their mobile phones to send e-mail message and access the Internet. They use a new kind of mobile phone called “i-mode”. You can even use a mobile phone listen to music.Mobile phones are very fashionable with teenagers. Parents buy mobile phones for their children. They can call home if they are in trouble and need help. So they feel safer. But teenagers mostly use them to keep in touch with their friends or play simple computer games. It’s cool to be the owner of a small expensive mobile. Research shows that teenage owners of mobile phone smoke less. Parents and schools are happy that teenagers are safer and smoke less.
But many people dislike them. They hate it when the businessman opposite them on the train has a loud conversation on his phone. Or when mobile phones ring in a café or restaurant. But there is a much more serious problem. It’s possible that mobile phone can heat up the brain because we hold the phone so closed to our bead. Scientists fear that mobiles can perhaps be bad for your memory and even give you cancer.Mobile are popular among people because _______（ ） A．they think mobile are fun
B．they believe mobile are safe
C．they love to listen to music
D．they feel it easier to talk to each other
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