To test whether doing something good every day can keep us healthy, I took part in an experiment. Two scientists from King’s College London have provided a lot of help to finish it.
Soon I received a box. Every morning, noon and night for seven days, I collected my saliva (唾液)with some little plastic tubes(管子) and they were sent back to the scientists to get my cortisol (皮质醇)levels.
During the first four days I did what I was told. For the next three days, I did good things. On the fifth day, I found my spirits were lifted and I felt happier. I bought a small box of chocolates for a kind lady at the library. At a flower shop, I opened the door for an elderly woman. For the next two days, I bought sandwiches for a homeless man. I prepared some cookies for my husband and his friends to eat.
After seven days, I collected the saliva and sent it back to London. About two weeks later, I received the results.
They found that during the last three days when I did good things, my cortisol levels were lower than that during the first four days, showing that my stress levels were low. On my first day of doing good things, my cortisol levels are quite high, but by noon they’re down—because I’ve already started doing good things.
I realized that it’s easy to do good things and we may become healthier by helping others.
50. Who provided a lot of help for the writer to finish the experiment?
A.Two doctors from China. | B.Two homeless men on the street. |
C.Two college students from Japan. | D.Two scientists from London. |
51. What happened to the writer on the fifth day during his experiment ?
A.He always wanted to stay alone. |
B.He felt less excited and more peaceful. |
C.His spirits were lifted and he felt happier. |
D.His cortisol levels didn’t change and he felt hopeful. |
52. What is the best title for the text?
A.Taking Part in Scientific Experiments Is Popular |
B.Doing Good Things Makes Us Healthier |
C.Eating Chocolate Brings No Harm to Us |
D.Stress Levels Depend on Eating Habits |