1. (2022八上·南宁开学考) 根据短文内容，选择最佳选项。

Everybody enjoys acts(行为) of kindness. But can you tell why? Some people think kindness is something out of love, while others believe it is just for being more popular. But research(研究) shows that being kind can activate(激活) a part of brain called Striatum and make us feel better. Why and how does it happen? Here are a number of different ways.

Being kind can make someone smile. If you see yourself smile, people around you may be smiling too. This is especially true for your close friends and family. A kind act makes someone who is sad feel better. It can also make ourselves feel good. So why not start that chain(链条) of good feeling to people around?

Secondly, being kind starts or develops a social connection with other people. Kind acts like buying someone a present make friendships stronger. Research shows that spending money on others may help you get a stronger feeling of happiness than spending it on yourself. In the same way, charities(慈普) also help people to connect with someone on the other side of the world.

In another recent research, even children in their first year of middle school know how being kind makes them feel happy. If one person is kind, he or she makes others in the group kind. Imagine that you make cakes for your friends and it makes others do it each month. Then you are getting cakes a lot more days than giving them.

The story doesn't end here. Research also shows that being kind and being happy makes it a wonderful two—way relationship. Being kind may make you feel happier, and if you are happy, you can act much more kindly.

1. （1） How does the writer leads in the topic?

   A . By telling a story. B . By asking questions. C . By giving numbers. D . By sharing a poem.
3. （2） What does the underlined word"It" in Paragraph 2 refers to(指的是)?

   A . The smile. B . The family. C . The kind act. D . That chain.
5. （3） Which of the following best shows the structure of the passage?

   A . B . C . D .
7. （4） What do these researches show?

   A . We should buy presents for all the classmates. B . Eating cakes every month makes people happy. C . If you are happy, you don't need to be kind. D . It's good for us to be kind and smile at others first.
9. （5） What's the purpose(目的) of this passage?

   A . To introduce why and how being kind makes us happy. B . To show middle school student' kindness. C . To compare different kind acts. D . To teach us how to do research on kindness.