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When you are sick with a cold or the flu, you may have a runny nose. Why is it called a runny nose? Because the mucus(粘液) is flowing and dripping from your nose. Yucky! But, guess what? Mucus is very helpful. Just hearing the word is enough to make some people uneasy, but science tells us that mucus is our friend. New research has found that health benefits can come from mucus and viruses.

Mucus is a clear, gel-like substance. It is very slimy. Mucus is a substance that is to protect body itself. Jeremy Barr, adjunct professor at San Diego State University, says that when you have a virus, it can cause many illnesses. He says this virus when mixed with mucus cells in the body, can help protect it against bacteria. Phages are a special kind of virus because they only infect and kill bacteria. They don't infect humans or other animals. Our research shows that these phages stick to mucus layers all over your body and they work with your body to protect and control the bacterial community that can live in your mucus layers. Mucus also helps protect your lungs from dust, bacteria, cigarette smoke, exhaust fumes and other intruders. Jeremy Barr says he hopes the research will give new fields of phage research, even to help prevent food-borne outbreaks. So the next time you have a cold, remember your mucus—along with the phage virus—works hard to make you healthy and keep those harmful bacteria away.

1.Science tells us that mucus is our _______.

A sister

B friend

C brother

D classmate

解析：选B。细节理解题。根据第一段倒数第二句but science tells us that mucus is our friend.可知，故选B。

2.Hearing the mucus first can make people _______.

A uneasy

B happy

C tired

D sad

解析：选A。观点态度题。根据第一段倒数第二句Just hearing the word is enough to make some people uneasy可知，故选A。

3.How does mucus work in our body?

A Mix with viruses to protect against bacteria.

B Infect and kill bacteria.

C Control bacteria community that can live in mucus layers.

D Keep away from bacteria.

解析：选A。细节理解题。根据第二段五句He says this virus when mixed with mucus cells in the body, can help protect it against bacteria.可知，故选A。

4.Mucus can make you _______.

A keep away from the illness

B keep unhealthy

C have a cold

D stay away from the bacteria

解析：选D。细节理解题。根据第二段最后一句works hard to make you healthy and keep those harmful bacteria away可知，故选D。