题目内容：

    There is nothing worse than sitting next to someone whose breath smells bad. In order to solve this problem, people have tried various methods since thousands of years ago.1.. Nowadays, we use gum（口香糖）instead and it seems to be much easier.

2. Scientists can even tell whether or not somebody has a disease just from a simple breath test now.

How does it work? Breath is made up of waste chemicals that the body makes.3.In fact, they are just like fingerprints （指纹）一that’s why scientists sometimes call them “ breathprints” .

Compared with other kinds of tests, a breath test is much quicker. Instead of taking hours, it only takes a few minutes.4.This machine will help to test their breath. It has been useful in finding early signs of problems such as stomach cancer.

Now, scientists are trying to use breath tests as many as they can.5.

A．There are many ways to make your breath smell better

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

C．How your breath smells says a lot about your health

D．In ancient China, people used to eat a special plant to make their breath smell better

E. Hopefully, someday, visits to the hospital will be a lot quicker and easier for everyone

F. Breath tests are also a lot easier to do than regular tests as people only need to blow into a special machine

G. Scientists from the Swiss Federal Institute of Technology found that these chemicals are different for each person