问题 填空题

能源与人类生产、生活息息相关,请回答下列问题:

⑴氢气是清洁燃料,氢气在氧气中燃烧的化学方程式为_______________。

⑵煤不充分燃烧时会产生大量的有毒气体,该气体是_______;

⑶从“低碳经济”的角度分析,在氢能、化石燃料、太阳能、风能等能源中,应尽量减少_____的使用。

答案

⑴2H2+O22H2O

⑵一氧化碳(或CO)

⑶化石燃料

阅读理解

阅读理解

     根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中的两项为多余选项

     No fight can end, and no friendship can move on, until everyone says these little words: I'm sorry.

Sometimes, though, they can be difficult to say,  1  .

     It's not about winning.

    Friendships aren't like the Super Bowl, and there should never be a winner and a loser. When you start

fighting with a friend, it may feel important that you "win" the fight by proving you're right and he is wrong, or by making him be the first to apologize.

        2  

    You may have heard the expression "His pride stood in the way." It is usually used to describe a

person who is so determined to be"right"that he lets an opportunity for happiness pass him by forever.

   3   Remember: as time goes on, we usually forget who was right and who was wrong in a disagreement, and only remember the sadness of losing a friend.

   Take the first step.

    Are you sick of fighting? Do you think this fight is just not important enough to ruin your friendship?

  4   You don't have to take full responsibility for starting the fight, or even say that your feelings were

wrong. But you should find something you did or said that's worth apologizing for. Maybe you're sorry

that you let the fight go for so long, of that you overreacted(反应过度的) to something your friend did.

If you say you are sorry, it's like an invitation for your friend to do the same.      5  

A. Then try to be the first to apologize.

B. Stop thinking about your pride.

C .It's about taking some resposibility for the argument.

D. Don't let this happen to a friendship you care about.

E. Here are some things to keep in mind.

F. There are some special cases when you shouldn't be the one to apologize first.

G. Once you've both said it, you'll both feel a million times better.

单项选择题