شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 10779

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?

Plants and trees are considered to be the rescuers of the nature. If we don’t save them, our next generation will have to pay for it. Just take care of them and they’ll take care of you. A study shows that having trees in your neighborhood will keep you away from many mental and physical diseases. They have a very stimulating impact.

Global warming has become the hot topic of the day. Earth’s temperature is rising day by day which is triggering many issues regarding health, nature conservation and many others. One of the major reasons for the issue is cutting down the trees. Trees absorb dangerous ultraviolet rays and greenhouse gasses and by acting as natural air conditioners and a source of rain, they are one of the most important controllers of global warming. So, “Save trees now, they will save you in the future.”

The word “they” in paragraph 2 refers to … .