问题 填空题

用相应物质的化学式填空:

古代山西有许多领先的化学工艺.如1989年永济出土四尊唐代铁牛,每尊重达30t,震惊中外.现代炼铁用 _________ 气体还原铁矿石,而唐代炼得如此多的铁,所用还原剂是用木材制得的一种黑色固体 _________ ,十分不易.这样炼得的铁易生锈变为 _________ (填主要成分),因此铁牛留存至今,极为珍贵.又如,2003年6月在西安出土的两千多年前的“西汉美酒”醇香扑鼻,其中主要成分是 _________

答案

CO;C;Fe2O3;C2H5OH.

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阅读短文,根据其内容回答问题。

     Do you want a happier, healthier family? Here's a simple way: Eat with your family more often.

     Increasingly, researchers are discovering the importance of family mealtime. Several recent studies have

pointed to the same result: Children who often eat dinner with their parents are happier and have fewer

behavior problems.

     Dr Blake Bowden, an American researcher, carried out one study. He found that young people who have

family dinners at least five times a week may not use drugs. They are often happier and do better in school.

     Clearly, family dinners are important for a child's development. Why? Because dinnertime offers busy

families a good chance to sit down together and talk. The relaxing conversation at the dinner table helps keep

good family relationships (关系). And good family relationships help children develop self-respect and a sense

of belonging.

     Family relationships can also influence a person's health. One study shows that children who enjoy close

relationships with their mothers will not develop serious health problems.

     Sadly, however, meaningful family time is too often forgotten. Parents are busy working and children are

busy studying for tests. According to Dr Blake's study, nearly 25 percent of people say that they have little

time for family.

     According to another study, people spend only about 50 minutes of free time with family each day. And

those 50 minutes are not well spent on meaningful conversations, either. Many parents say they know little

about their children's friends.

     So how can families find more time for each other? How can they enjoy more family meals and

conversations? They need to make.choices. For children,they'd better not spend so much on their tests, but

they may risk (冒险) falling behind their classmates. For parents, they need to go back home earlier and risk

not getting a high position. But for families who do make those tough choices, the rewards are rich. Making

time to eat dinner with family does more than feed the body-it nourishes (滋养) the heart.

1. Are family dinners important for children?

    _____________________________________________________________

2. Why is meaningful family time often forgotten? 

    _____________________________________________________________

3. According to a study, how long do people stay with family each day? 

    _____________________________________________________________

4. What should parents do to keep good family relationships? 

    _____________________________________________________________

5. How do good family relationships help children? 

    _____________________________________________________________

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