Thanks to better health care，most people are living healthier and longer lives.Someone who is born today can expect to live about thirty-five years longer than someone who was born in the nineteenth century.（A） In the future more and more people will celebrate their hundredth birthdays.Here are five rules for a healthy life.
    It's comfortable to sit on the sofa and watch TV.But doctors say you should get off the sofa.To keep fit，you have to walk at least 10，000 steps every day.In the past，people's job requires more physical effort.They often had to walk for miles every day.When farmers were working in the fields，they were keeping fit at the same time.Think about it：Do you get the same amount of exercise today as they did in the past？
    It is important to eat food that is fresh and natural，for example，fruit and vegetables.Eating too much of the wrong food will harm your health.（B）快餐是不健康的。You should only have it once in a while.
    When we were babies，we slept for much of the night.Teenagers do not need as much sleep as babies，but it is important for you to get about eight hours' sleep a night.At weekends，you have got more time，so use it not just for your friends，but for rest too.
    Many people believe that happiness is important for our general health.Sometimes it is not easy to be a teenager because of the difficulties of school exams or friendships.If you are worried about something，talk to your parents or your teacher.
    Smoking is not cool.It's dangerous.It harms nearly every part of your body.Think about how your family and friends will feel，and think about what it will do to your health.

（1）請從文中找出所給句子的同義句：
Sitting on the sofa and watching TV are comfortable.

It's comfortable to sit on the sofa and watch TV.

It's comfortable to sit on the sofa and watch TV.

（2）請將文中（A）句翻譯成漢語。

在未來，越來越多的人將慶祝他們的百歲生日。

在未來，越來越多的人將慶祝他們的百歲生日。

（3）請將文中（B）句翻譯成英語。

Fast food is unhealthy.

Fast food is unhealthy.

（4）文中劃線"it"指代什么？

Smoking

Smoking

（5）Why is it sometimes difficult to be a teenager？

Because of the difficulties of school exams or friendships.

Because of the difficulties of school exams or friendships.