题目

以化合价为纵坐标，物质类别为横坐标所绘制的图象叫价类图，如图表示碳的价类图。请回答 （1） A是天然气的主要成分，其化学式为。B点对应的物质类别是。 （2） 物质D在固态时俗称，其用途有（写一种）。 （3） B和D反应生成C的化学方程式为。该反应中，物质B表现了性。 （4） D和水反应能生成E，化学方程式为。该反应属于（填基本反应类型）。Summer holidays give us more time for r 1       books. Children are more interested in reading books than adults (成人) .We can fly in the world full of imagination (想象) ，v 2       great people and enjoy wonderful stories. Books are our w 3       to the world.Today many children like to watch TV,play computer g 4       or go on the Internet. These things let children 1 5       imagination. If you ask any child about a famous writer,you will get an answer like "I don't know anything about him        (or her) . " But if you ask them about a hot TV program or a popular computer game,they will tell you e 6       about it.Books are people's best f 7       . But today's children don't read books often. They lose the habit (习惯) of reading. Reading is one of the best h 8       a person should have. We can get pleasure (快乐) and k 9       from good books."Children should have the habit of reading," an education official (官员) says. "Books can become a beautiful net. They help children save their purity (单纯) ，happiness and courage (勇气) ."Parents can help. They can read bedtime stories to children. If parents have the habit of reading books,children will be likely to f 10       them.1. r       2. v       3. w       4. g        5. 1         6. e       7. L      B. h        9. k       10. f