题目

Mr. Brown is 75 years old. He lives in a small village. Mr. Brown has three sons, David, Ieff and Stefan. They have jobs in big cities. And they don’t come to see Mr. Brown very often.The sons feel sorry for their father, so they build a big house for Mr. Brown. And they give him a lot of money.But it doesn’t make Mr. Brown happy. He always feels lonely.There is a school next to Mr. Brown’s house. Some students often come and visit Mr. Brown. He says.“I don’t want money. I want love. And the student give it to me. Love is not money. Love is company.【1】Mr.Brown is __________ years我们学习九年级化学前七单元后就建立了三个观念，即：元素观、微粒观和能量观．元素观：物质的种类非常多，但是组成这些物质的元素种类目前只发现了一百余种，如氢气和水中所含的     元素是相同的；微粒观：科学技术证明，物质确实是由微小粒子--分子、    和离子构成的；能量观：化学变化中伴随能量变化，可燃物燃烧产生能量，叫放热反应，还有的化学变化是吸热反应，如实验室用氯酸钾制氧气在     条件下才能完成，这是典型的吸热反应．