It is a cold and dry winter morning. When you wake up, you feel that your throat hurts. You begin to sneeze and later you may cough. You must have a cold! Wait a moment. Could it just be a common cold or the flu (流感) that’s been going around?
A cold gives you a runny nose and cough. But it’s usually easy to deal with. Some take medicine while others drink herbal tea or chicken soup. Usually you feel better after a week.
On the other hand, the flu can be much more dangerous. It usually gives you fever. Sometimes it can cause death. According to an American magazine, the worst flu killed about 50 million people from 1918 to 1919.
Don’t worry. If you get a flu vaccine (疫苗), it can stop you from getting the virus (病毒). Flu vaccines work by giving the body a small amount of flu viruses. This causes your body to develop antibodies (抗体). So next time you get the flu, the antibodies should help you.
The flu virus changes every few years. Therefore, there are so many types of flu, such as H1N1 and H5N1. The antibodies for one type of flu can’t help us against all types of flu. That’s why we need to get the vaccine every year.
However, good health habits may also help stop you developing a cold or flu. Washing your hands often helps stop you from getting viruses. It is also important to get regular exercise and eat healthy food. All these can help you strengthen your immune system (增强免疫系统).
【小题1】If you have a common cold, usually you’ll feel better after ________.

　　Our body can make some vitamins（维生素）. When sunlight shines on the skin（皮肤）, the body produces Vitamin D. Some vitamins cannot be made or stored in the body. Vitamin C is an example. If a person doesn't take in any Vitamin C for a long time, a deficiency（缺乏）can develop in the body.

　　Many people also take vitamin pills. Most vitamin pills contain（包含）man-made vitamins, which are made in labs. Natural vitamins are found in foods. The vitamins that are added to natural foods are also man-made.

　　In the future, scientists may discover several new vitamins. New uses may also be discovered for the known vitamins. Scientists are experimenting to find out if vitamins can cure（治愈）or prevent diseases like cancer and heart disease. It may be that vitamins are even more important than we think.

A．we take much exercise

B．the sun shines on our skin

C．we eat much rich food

D．all of the above

A．from all kinds of foods

B．in the lab

C．of fresh milk

D．from the sunlight

A．know whether vitamins can stop some illness

B．make much more vitamin pills

C．become well-known in the world

D．help the patients who need Vitamin C

A．The vitamins that are added to natural foods are also natural.

B．If you want to be healthy, you'll have to eat more vitamin pills.

C．Vitamins are very important for our health.

D．We can take vitamin pills instead of natural vitamins to keep healthy.

1. The rainforests can give us many _________(use) things.

2. Don’t keep your friends _________ (wait) so long.

3.Han Mei spends two hours _________ (practice) English every day.

4. When you’re out, You’d better take care of ________ (oneself).

5.If you want to be thinner, you must eat _______ (little) food and take more exercise.

6.Running can help you keep _______ (health).

7.Ann is going to go _______ (skate) with her classmates tomorrow.

8.Can you tell me your reason for_______ (leave) home in a hurry?

9.He is going away for at _______ (little) a week.

10.Take care of your_______(tooth) or you’ll have a toothache.