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People have understood that kindness is good for the person who receives help. For example, when we give food to a hungry person, he is blessed. However, scientists have recently begun to study the effect kindness has on the person giving it. What they have found is that doing good is good for the doer. Acts of kindness can improve health, help a person reach goals and even add years to a person's life.

The first study to show the connection between doing good and living a long life was a study on aging. Beginning in 1956, scientists studied a group of married mothers for 30 years. They thought the women with the most children would die first. But the number of children a woman had did not matter. Wealth did not matter. Education did not matter. What did matter was whether they volunteered. Women that volunteered had fewer diseases during their life.

Many other studies have found the same positive effects. Helping other people improves long-term health. The gains are the same for men, women, old people and the young. Those who volunteered had fewer serious diseases than those who did not volunteer. This included diseases such as heart attack, cancer and stroke.

Scientists are researching many possible causes. One possible cause is an increase in antibodies (抗体), which help fight against disease. One study showed the body produces more antibodies after an act of kindness. This increase in antibodies can last nearly an hour after one act of kindness is finished.

Another one is an increase in a chemical that fights the effects of stress from life. Scientists have found a link between being kind to people and an increase in the chemical oxytocin. Oxytocin is a chemical produced in the brain. It reduces many of the harmful chemicals the body produces under stress.

1.What did the study in Paragraph 2show? ______

A. Diseases age people fast.

B. Doing good is good for one's health.

C. Women with more kids die earlier.

D. A long marriage leads to a long life.

2.What can we infer about antibodies from Paragraph 4? ______

A. More antibodies may not be good.

B. They help people reduce pressure.

C. They increase with one's kind acts.

D. The more antibodies, the more oxytocin.

3.How does the author develop the last two paragraphs? ______

A. By explaining the causes.   B. By making comparisons.

C. By introducing a method.   D. By describing a chemical.

4.What's the main idea of the text? ______

A. Everyone needs to be cared for.

B. Happiness is connected with kindness.

C. Try your best to help someone in need.

D. Helping others means helping yourself.

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