题目内容：

    Many people use their mobile phones as the alarm clocks and are often used to check e—mails before sleeping.

Many years ago, my boss stayed up playing with her mobile phone and got badly ill because of that, Now she always leaves her phone in another room when going to sleep. And she encourages her friends to do so. "I sent each of my friends the same Christmas gift—an alarm clock. So they could stop using the phones as the alarm clocks, "she said.

If your mobile phone wakes you up in the morning, it may also keep you up at night. A study shows that people in mobile phone radiation（辐射）mostly have sleeping problems. And according to a Swedish study, a quarter of young people in this country feel like having their phones near them. Most of them feel sorry for not replying to messages, so they even have to reply to their friends before sleeping.

A recent study has shown that three quarters of people aged between 18 and 34 prefer to sleep with their phones near them. That number falls off a little in the middle age, but only people aged 65 and older like leaving the phones in another room while sleeping.

跟据短文内容, 选择最佳答案.

1.The underlined word “that” here refers to __________.

A.using the mobile phone as an alarm clock

B.leaving the mobile phone in the bedroom

C.staying up playing with the mobile phone

D.sending or receiving e—mails at night

2.According to a Swedish study, a quarter of young people put their mobile phones around them before sleeping so that they can_________.

A.play games on phones B.surf the Internet

C.reply to their friends D.get a Christmas gift

3.From the last paragraph, we know three quarters of the people ___________ prefer to sleep with their mobile phones near them.

A.aged between 12 and 18 B.aged between 18 and 34

C.in the middle age D.aged 65 and older

4.Which of the following is THUE according to the passage?

A.The writer's boss likes leaving her mobile phone in her bedroom now.

B.The writer's boss sent alarm clocks to her friends as gifts.

C.Many people use their mobile phones as the alarm clocks to keep them up all night.

D.Nearly all people prefer to leave their mobile phones near them at night.

5.We can probably read the passage in a（n）____________.

A.magazine on health B.story book C.novel D.ad（广告）