閱讀下面短文，根據其內容完成后面各項任務。
Five rules for a healthy life Thanks to better health care，most people are living healthier and longer lives.It's even thought that in the future more and more people will celebrate their hundredth birthdays.Here are five rules for a healthy life.
    1.Get off the sofa!
    Sure，it's comfortable to sit on the sofa and watch TV.But doctors say you should get off the sofa.要保持健康，你每天至少應走 10，000步。In the past，people's jobs required more physical effort.They often had to walk for miles every day.When farmers were working，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？
    2.Eat healthy food!
    It's important to eat food that is fresh and natural，for example，fruit and vegetables.Fast food is not healthy.You should only have it once in a while.Eating too much of the wrong food will harm your health.
    3.Rest while you can!
    When we were babies，we slept for much of the night .Teenagers do not need as much sleep as babies，but it's important for you to get about eight hours' sleep a night，At weekends，you've got more time，so use it not just for your friends，but for rest too.
    4.Don't worry.Be happy!
    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're worried about something，talk to your parents or your teacher.
    5.Say no to smoking!
    Yes，you knew I was going to say this!It's so important.Smoking is not cool. It is 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）將文中劃線的漢語句子譯成英語。

In order to keep healthy，you should take at least 10，000 steps every day.

In order to keep healthy，you should take at least 10，000 steps every day.

（2）從文中找出與下面所給句子意思相近的句子。
If you eat too much of the wrong food，your health will be harmed.

Eating too much of the wrong food will harm your health.

Eating too much of the wrong food will harm your health.

（3）將文中劃線的英語句子譯成漢語。

當我們還是孩子的時候，我們幾乎整晚都在睡覺。

當我們還是孩子的時候，我們幾乎整晚都在睡覺。

（4）回答問題：
How many kinds of difficulties are mentioned in the part"4.Don't worry.Be happy!"？

Three kinds of difficulties are mentioned.

Three kinds of difficulties are mentioned.

（5）回答問題：
What does the underlined word "It" in the last paragraph refer to （指 ）？

Smoking.

Smoking.