شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 9317

I suppose it’s ................... for a mother to feel sad when her children leave home.

There are only a few scientists and inventors who are famous all over the world. They can help people by developing science and health. Their inventions and discoveries play a vital role in our life.

Many years ago, lots of people died because of strange diseases. No one knew the reason till the French chemist, Louis Pasteur, solved the problem. Louis Pasteur was born in 1822 in France. He got interested in science when he was a young boy. Interesting to know, he found that bacteria are living things, and they are the causes of some diseases. He is called the "pioneer of the germ theory". He could save many people by developing this theory.

Louis Pasteur was a hardworking man. He spent much time conducting experiments and researches. His memory will live on because of developing medicine. He died in 1895.

According to the passage, which sentence is true?