I used to _____ to rock music, but now I

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问题选择题

I used to _____ to rock music, but now I collect coins. [ ]

A. listening

B. listen

C. listens

答案

答案：B

完形填空

Complete the dialogue with proper words or sentences.

A: Hi, Cathy! You look excited. 小题1:_______？

B: I’m going to spend my summer vacation in Hong Kong. I’ll visit Disneyland. My dream to meet Mickey Mouse and Donald Duck will come true.

A: 小题2: ？

B: No, with my parents. We’ll fly there as soon as the final examinations finish.

A: That’s great! If you go to Hong Kong, 小题3:______. Hong Kong is

a shopping paradise (购物天堂).The things there are more fashionable.

B: Of course I won’t But maybe my mother will be more interested in it I prefer eating to shopping.

A小题4: ？

B: Seafood is my favorite. I also like different kinds of desserts.

A: If so, Hong Kong will be suitable for you. There are many kinds of delicious food you can enjoy.小题5:____________.

B: Thanks. See you!

问答题

I向一金属铝的易拉罐内充满CO₂，然后向罐内注入足量NaOH溶液，立即用胶布严封罐口，过一段时间后，罐壁内凹而瘪，再过一段时间后，瘪了的罐壁重新鼓起，解释上述变化的实验现象：

（1）罐壁内凹而瘪的原因：______

反应方程式：______

（2）罐壁重新鼓起的原因：______

反应方程式：______

II某学生课外活动小组利用如图所示装置分别做如下实验：

（1）在试管中注入某红色溶液，加热试管，溶液颜色逐渐变浅，冷却后恢复红色，则原溶液可能是______溶液；加热时溶液由红色逐渐变浅的原因是______．

（2）在试管中注入某无色溶液，加热试管，溶液变为红色，冷却后恢复无色，则此溶液可能是______溶液；加热时溶液由无色变为红色的原因是______．