阅读理解。
     An apple a day keeps the  doctor away. Well, milk may work in the same way！
     Milk is the natural food for mammalian (哺乳动物) babies. It helps them grow strong because it is rich
  in protein (蛋白质),calcium (钙) and witamins. Milk can also help you sleep better because it calms you
  down. But remmber to drink milk with care. Find out how old the milk is. Make sure it is fresh and hasn't
  gone bad. Don't drink milk when yoour stomach is empty. Eat some bread or corn at  the same tome.
 That'll help you take in more protein and vitamins. Doctors say teens need at least 500ml of milk a day.
 That's  two to three  cups.
     Milk-drinking started ling ago, as early as 6000~8000BC. At that time pepole started to keep cows,
 sheep and goats to get their milk.
     Of course what you drink today isn't that fresh from the cow. People cool the fresh milk down to 4 ℃
 to stop the bacteria growing. In factories, milkis pasteurized (灭菌) to stop it going bad. After
 disinfection (消毒) and packaging , it goes to the supermarkets.
     Yogurt (酸奶) also comes from milk. People make some special bacteria to change the  taste of milk
 and make the nutrients (营养) in it easier for people to take in . Maybe that's why it's  getting more
  popular with pepole!
1. The sentence "An apple a day keeps the doctor away." Tells us that _____.
    A. the doctor likes to eat apples every day
    B. the doctor doesn't like apples at all
    C. the doctor eats an  apple each day
    D. apples are good for our health
2. When you drink milk ,you'd better _____
    A. find out when milk was produced
    B. make sure it is fresh and has not gone bad
    C. not drink milk when your stomach is empty
    D. do all of the above
3. Why is it better to eat some bread or corn whiledrinking milk?
    A. Our body can take in more protein and vitamins in this way.
    B. That;ll help us grow taller and stronger.
    C. That'll help us taste milk better.
    D. We'll still feel hungry without eating sone bread or corn．
4. Which of the following statements is true?
    A. One cup of milk is good enough for teens each day.
    B. Drinking milk is likely to make teens sleepy.
    C. To stop the bacteria growing,people cool the fresh milk to 4℃.
    D. Yogurt is ong kind of milk which has gone bad .