Do you have a healthy eating habit? As we know, a healthy eating habit is good 1    health. Of all the things we eat and drink,   2__ is the most important. Not
 3__ people know this, but it is quite true(真实的). Our bodies can go   4__ food for a long time.  5__ for two or three days without water people may die.
Many people don’t know   6__   water our bodies need to work well. And they don’t drink   7__ water, especially(尤其) in hot weather. Most people drink only when they   8__ drink. But in fact they often   9__ more water, especially after they have sports.
Do you know 65% to 75% of a man’s   10__ is water? If we don’t have enough water, we feel tired and may become ill.
(   )1. A. for          B. of            C. in            D. by
(   ) 2. A. fruit          B. vegetables    C. water         D. food
(   )3. A. a lot           B. many        C. little           D. few
(   )4. A. for         B. with         C. without        D. through
(   )5. A. And        B. Then         C. So            D. But
(   ) 6. A. how much    B. how many   C. how           D. why
(   )7. A. any          B. some         C. a little         D. enough
(   )8. A. try to         B. want to       C. in need        D. like
(   )9. A. must         B. can          C. need         D. needn’t
(   )10. A. head    B. arms C. heart    D. body

How to Become Fit?
Healthy eating habit along with regular exercise is the only way to become fit. If you have the correct number of calories and exercise regularly, you will lose weight, keep fit, and feel great, too.
During your teenage years, it is important to give your body the energy it needs. If you skip (跳过) meals, you won’t get enough calories, and then you will feel tired. By the way, calorie is just another word for energy. About 50% of your calories should come from rice, bread, vegetables and fruit. You also need to drink a lot of water, 6 to 8 glasses a day. Water helps keep your system clean. Drinking enough water will make your skin better and make you healthy.
Exercise is something that can help to make you look good, feel good and be healthy. Experts suggest that teenagers spend at least 30 minutes exercising, five times a week. That is easy to do! You can walk or ride your bike to school, and do sports at school. However, teenagers often give up sports, saying they have no time left after their studies. In fact, doing exercise can help them sleep better at night and increase their ability to focus on their study.
If you follow the suggestions above, you will look and feel much better and become fit.
【小题1】 What’s the main idea of this passage?