There is nothing worse than sitting next to someone and being able to smell their breakfast! In ancient China, people used to chew a special plant to make their breath smell better. Now, we use gum (口香糖) to make sure our breath doesn’t bother other people.

In fact, how your breath smells says a lot about your health. According to BBC News, scientists can now tell whether somebody has certain diseases just from a simple breath test. How does it work? Breath is made up of something known as “metabolites (代谢物)”. Metabolites are a kind of waste that the body makes. Scientists from the Swiss Federal Institute of Technology found that metabolites are unique (独特的) to each person’s breath. They are just like people’s fingerprints (指纹). That’s why scientists sometimes call them “breath prints (呼吸指纹)”, the Daily Mail reported.

Compared to other kinds of tests, a breath test is much quicker. It only takes a few minutes. Breath tests are also much easier to do. People don’t need a needle (针) or a container (容器) to hold body fluids (体液). They just need to blow into a special machine. This machine will help to test their breath. It has been useful in finding early signs of diseases, such as stomach cancer.

Scientists are doing further research on breath tests. They think that these tests could be used for athletes to see if they are cheating.

【小题1】What does the underlined word “bother” mean?

A．Make others happy.	B．Make others excited.
C．Make others upset.	D．Make others relaxed.

【小题2】Doctors can use our breath smell to tell if we have certain diseases because ________.

A．we have different metabolites in our breath	B．we get diseases from the things we eat
C．each of us has diseases	D．each of us has different fingerprints

【小题3】Which of the following is TRUE according to the story?

A．It’s much cheaper to do a breath test than other tests.

B．A breath test can help doctors figure out why people are sick.

C．To do a breath test, people need to blow into a special machine.

D．Breath tests is often used to see if athletes are cheating.

【小题4】What is the best title for the story?

A．How to take a breath test	B．Why does your breath smell bad?
C．What can your breath say about you?	D．How to make breakfast smell better.