问题 选择题

下列事实可体现某些卤素或卤化物特有的性质的是()

A.氟化氢可用于雕刻玻璃

B.溴化银在光的照射下即可分解

C.单质溴在水和汽油中的溶解性不同

D.碘能使淀粉溶液变蓝

答案

AD

氟化氢(HF)能腐蚀玻璃,它与玻璃中的SiO2反应是氟化氢特有的性质,所以A符合题意。卤化银在光的照射下都分解,分解的通式为2AgX2Ag+X2,所以溴化银在光的照射下分解不是特有的性质,故B不符合题意。单质溴在水和汽油中溶解性不同不是溴单质的特性,碘单质也有相似的性质,C也不符合题意。碘能使淀粉溶液变蓝是I2的特性,其他卤素单质没有此性质,故D符合题意。

阅读理解

阅读理解

       You may know the song Happy Birthday very well. But do you know about its writer? It was written by an American girl. And she became very rich after that.

       When she was a child, she was poor. Once, she was invited to her friend's birthday party. She was

pleased but sad because she didn't have enough money to buy a gift for her.

       "The party is coming soon, but now I have little money." Tears ran down her face.

       Later that night she was in bed, thinking about the gift when the door opened and her grandma came

in." What happened? " her grandma asked. Hearing the girl's story, she said, "Don't worry. I think I can

help you. How about singing a song together? Happy birthday to …"What a beautiful song! They sang

and sang. Suddenly she woke up. It was a dream! She decided to write it down at once and sing it to her

friends at the party.

       When she sang the song at the party the next day, her friends were very happy. "How wonderfully you sing! We haven't heard such a beautiful song before. Thank you for giving me the special gift." said her

friend. And they learnt to sing it together. Later the girl became well-known in America.

1. The song Happy Birthday was written by                     .

A. an American girl

B. an American girl's grandma

C. an American boy

D. an American girl's friend

2. The girl was sad because                   .

A. she didn't want to go to the party.        

B. she would be busy that day.

C. she didn't have enough money to buy a gift.

D. she wasn't invited to the party.

3. What gift did she give her friend?                    

A. A flower.  

B. A toy.    

C. An interesting book.  

D. A song.

4. What did her friends think of the song?  It was                  .

A. boring        

B. beautiful  

C. exciting            

D. interesting

5. Which of the following is TRUE?

A. The girl was still poor after writing the song .

B. The girl sang the song with her grandpa in her dream.

C. The girl's friends had heard the song before.  

D. The girl became famous because of the song.

问答题 简答题