题干

下列实验操作和结论的说法正确的是(   )

A:取少量溶液于试管中,滴加BaCl2溶液,有白色沉淀生成,证明溶液中一定含有Ag+

B:只用水就可以将NH4NO3、BaSO4、CaO三种固体物质区别出来

C:向某固体中滴加稀盐酸,有气泡产生,则该固体一定是碳酸盐

D:把燃着的木条插入某瓶无色气体中,木条熄灭,证明瓶中的气体一定是二氧化碳

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答案(点此获取答案解析)

B

同类题3

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。选项中有两项为多余选项。

Questions you should ask yourself when you fail

    The more new things we try the more failure we are likely to have.____. Experiencing failure can be a learning experience and an opportunity for a fresh start. A good way to begin this process is by asking yourself some tough questions.

1)What can I learn from this?

Take responsibility for what went wrong. OK, so it was not all your fault—but some of it was. Successful people don't make excuses or blame others.____ So you should look at the experience objectively(客观地).

2)Do I need to acquire or improve some skills?

Did the problem reveal some lack of skill on your part? How could you learn or improve those skills? Perhaps there are books or courses or people you could turn to.____

3)Who can I learn from?

Is there someone to whom you can turn for advice? Did a boss, colleague or friend see what happened?____. Most people do not ask for help because they believe it to be a sign of weakness rather than strength. It's not. It shows that you are ready to learn and change.

4)What will I do next?

Now draw up an action plan. Will you try something similar or something different? Revisit your goals. Failure doesn't mean you have to give up; maybe you just need to change it in another way.  ____

A. You can now reset your sights on your destination and plan a new course.

B. Make them step stones to future success.

C. They take responsibility for the failure.

D. In fact the only way to avoid failure is to do nothing new.

E. The important thing is how we deal with failure.

F. Make a self-development plan to acquire the skills and experience you need.

G. If they are constructive and supportive then ask them for some feedback (反馈) and guidance.