题目内容：

We humans love to scare ourselves. Newspapers and TV news are full of shock-horror stories about the killer flu virus(流感病毒)but are there things we can do to cut our risk of catching it?

Every year, people in Britain catch the flu virus and some of those who are already ill, or are very young, may die. It is very sad, but modern treatment means that many deaths can be avoided.

Experts tell us that the world is another flu epidemic(流行)and that the latest bird-flu virus would be the most likely cause. Humans can catch the disease only after closely contacting with a sick bird. However, if someone who had normal flu was to come into contact with bird flu, this could be very dangerous. The bird flu virus could attach(附在)itself to the human flu virus, mutate and then start to spread from person to person.

Coughs and sneezes(打喷嚏)always have spread diseases, especially colds and flu, and they still do. If bird flu does begin to infect humans, it will spread through coughs and sneezes.

If you want to stay free of flu and someone coughs or sneezes at you, what should you do?

First, keep your hands away from your face and wash them and your face as soon as you can. If a cough or a sneeze spray misses your face and you accidentally touch a droplet with your hands and then touch your face, the flu or cold bug could creep into your system.

1.The chances of most people catching bird flu are very small because __________.

A. they are strong enough to resist the infection

B. only after closely contacting a sick bird can they be infected

C. bird flu does not happen very often in the world

D. only those who are ill can be infected

2.In the passage the underlined word “mutate” probably means“__________”.

A. differB. produceC. increase   D. change

3.If a man with common flu is infected with bird flu, __________.

A. there must be no cure for him   

B. the disease will spread among humans

C. he must feel cold             

D. he is likely to die

4.Which of the following statements is true according to the passage?

A. Bird flu is the most dangerous disease.  

B. Normal flu can be easily changed into Bird flu.

C. We don’t need to worry about flu virus.

D. The person who has normal flu and comes into contact with bird flu can easily get Bird flu.

5.The last paragraph of the passage tells us __________.

A. the reason why people with flu often cough   

B. coughs and sneezes are very dangerous

C. how to protect ourselves from being infected  

D. how to avoid coughs and sneezes