Louis Pasteur：Father of Microbiology Louis Pasteur is known as one of the most important scientist in history.Pasteur is famous for developing the germ （細(xì)菌） theory of disease，creating the process of pasteurization （巴氏滅菌法），and for changing the way that scientists create vaccines （疫苗）.
   Louis Pasteur was born on December 27，1822 in Dole，a small town in eastern France.During his early education，he was an average student who enjoyed art.This changed however，in his high school years，as he became more and more interested in scientific subject.He earned his bachelor （學(xué)士） of arts degree in 1840，and a bachelor of science degree in 1842.He moved to Paris to study physics and chemistry and received his doctoral degree in 1847.
   In 1848，he became a professor of chemistry at the University of Strasbourg，where he met Marie Laurent.He and Marie married in 1849.They had five children，however，three died young，from typhoid fever.It was the deaths of his children that drove Louis to investigate infectious （傳染性的） diseases in order to find a cure.
   During Pasteur's time，people believed that microbes （微生物） such as bacteria appeared due to"spontaneous generation （自然發(fā)生）".Pasteur ran experiments.Through his experiments he proved that germs （bacteria） were living things that came from other living things.They didn't just spontaneously appear. This was a major discovery in the study of biology.
   He also discovered that milk turns sour because of tiny organisms that are too small to be seen without a microscope.This discovery led to the development of pasteurization （named after him），the process of gently heating food or drink to kill harmful germs.Thanks to Pasteur's research，many of the drinks we buy today are safe to drink.

（1）What is the first paragraph mainly about？

It's about the honor of Louis Pasteur

It's about the honor of Louis Pasteur

（2）How many degrees did Louis Pasteur earn and what are they？

Three.

Three.

（3）When did Louis Pasteur begin to investigate infectious diseases？

After the deaths of his children.

After the deaths of his children.

（4）What does the underlined word "This"in Paragraph 4 refer to？

Germs（bacteria） were living things that came from other living things.

Germs（bacteria） were living things that came from other living things.

（5）What is pasteurization according to the passage？

The process of gently heating food or drink to kill harmful germs.

The process of gently heating food or drink to kill harmful germs.