水银的密度为13.6×10³kg／m³，它表示的意思是（   ）

如图所示实验装置可用于制取乙炔．

请填空：

（1）A管的作用是 ____，制取乙炔的化学方程式是 ____　．

（2）乙炔通入KMnO₄酸性溶液中观察到的现象是 ____，乙炔发生了 ____反应．

（3）乙炔通入溴水的CCl₄溶液中观察到的现象是 ____．

（4）为了安全，点燃乙炔前应 ____，乙炔燃烧时的实验现象是． ____

    Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine and good food very much. The servant always drank the wine and ____ (eat) up all the nice food in the house every time the rich man left his home. The rich man knew what his servant did, ____ he had never caught his servant doing that.

    One morning, when he left home, he said to the servant, "Here ____ (be) two bottles of poisons (毒药) and some nice food in the house. Take care of them." After ____ (say) these words, he went out.

    But the servant knew that the rich man lied to ____ (he). After the rich man was away ____ his home, he enjoyed a nice meal. Because he drank too much, he was drunk and fell to the ground. When the rich man came back, he couldn't ____(find) his food or his wine. He woke the servant up ____ (angry). But the servant told his story very well. He said ____ cat ate up everything. He was afraid to be punished (惩罚), so he drank the poisons ____ (kill) himself.

选择适当的句子补全下面5组对话。

A. It's red.      B. Thank you.      C. I hear a duck.  

D. Good morning, Ben.       E. Soup, please.