( )6. The underlined word "it" in paragraph 3 refers to "your ______".

( )7. If Tom wants to be good with his hands,he can ______.

( )8. After reading the passage,we know ______.

( )9. What's the structure of this passage?

BDBA

6. 第三段“Watching interesting TV shows is great for your body. When you laugh for 15 minutes or more, it exercises your heart and keeps it healthy.” 前句说对身体好，后句具体讲锻炼心脏并保持其健康，这里“it”指代前文的“watching interesting TV shows”，但问题问“it”指“your ______”，根据“keeps it healthy”中的“it”指代“heart”，所以选B。
7. 第五段“Children who play with building blocks can learn to use their hands to do small things well.” 可知玩积木能让手更灵活，选D。
8. A选项“keeps people tidy”文中未提及；B选项第三段“listening to music can make your heart strong”与“keeps the heart healthy”意思一致，正确；C选项第一段“you don't get money from doing it”，错误；D选项第六段“Bumping into others in a fun way can make unhappy children laugh”，错误。选B。
9. 第一段总述爱好的定义和好处；②-⑥段分别介绍不同爱好的好处；第七段总结爱好带来很多并让生活多彩。结构为总-分-总，即①/②③④⑤⑥/⑦，选A。