问题 填空题

在试管里放入一块铜片,注入一定体积的浓硫酸,给试管加热,使之反应。

(1)若铜片还有剩余,硫酸____(填“已”或“没有”)消耗完毕,其理由是__________________。

(2)欲观察生成的CuSO4溶液的颜色,应采取的操作是_____________。

答案

(1)没有;因随着反应Cu+2H2SO4(浓)CuSO4+ SO2↑+2H2O的进行,硫酸浓度会逐渐降低,而稀

H2SO4与Cu不反应,故H2SO4不会消耗完全

(2)将反应后的液体缓慢注入水中,边加边用玻璃棒搅拌,而后观察溶液的颜色

单项选择题
完形填空

“The Chinese Dream” is a hot topic of this year. Many Chinese young people are inspired(激励) by the Chinese Dream. Everyone has their own dreams. They give us courage and confidence(信心) to keep us going through difficulties. Here is some advice on how to realize our beautiful dreams.

Never giving up is the key to make our dreams come true. We may fail from time to time, but we can learn from failure(失败), correct our mistakes and try again until we achieve our goals. Our life is like a long journey which is not all roses. It sometimes has wind and rain. We believe rainbows(彩虹) will appear after storms.

Cooperation(合作)is also necessary. Everyone likes a person who is good at cooperating with others. Besides, in our society most problems can’t be solved by one person alone. Cooperation is becoming one of the most important ways for people living in the developing society.

At the same time, we should learn to examine our abilities because it helps us know our advantages and disadvantages as well as get a full control of ourselves. Then we may be confident enough to face challenges.

Follow the suggestions above, and our dreams are sure to come true.

根据短文内容,按要求完成下列各题。

小题1:What inspires many Chinese young people?

小题2: What is the key to make our dreams come true?

小题3:How many suggestions of making dreams come true are mentioned in this passage?

小题4:从短文中找出与下面句子画线部分意思最相近的单词。

We may fail from time to time.          ________ 

小题5: In the passage, the underlined word “It” refers to(指) ________ .