根据下列实验装置图，回答问题：

(1)利用A装置制取气体的依据是__________

(2)请从图中选择合适的发生装置和收集装置____________（填序号），制取一种你熟悉的气  体____________（填化学式），发生反应的化学方程式为____________。  

(3)用F来代替B装置制取气体的优点是：____________（答出一条即可）。 

(4)实验室用FeS固体和稀硫酸在常温下反应制取H₂S气体，H₂S密度比空气大且会与水发    生反应。试推测制取时所用的发生装置是___________（填序号，下同），依据是 ____________，收集装置是___________，依据是__________。

a. How could I excite my students and show my warmth, so that they could enjoy their study in English I had a deep thought. b. In order to save my face,I just criticized them seriously whenever they talked in class or even moved a little c. It was smile. There was a kindness called smile. It was the most beautiful language in the world. It could make distance disappear. d. Then I realized my frozen eyes made the students seared and my aerious face took any excitement away from the children’s hearts. e. The next day,I stood on the stage with a smiling face, asking questions with a smile and encouraging the children in a friendly way. I could find happiness and excitement in their eyes ! f. I could control the class now, but the atmosphere became strange. No, they were not listening to me. g. It was too quiet. The breathless silence urged me to consider the way I was teaching. h. I remember,five years ago, when I stood at the teacher’s desk for the first time, the students in my class paid no attention to me,didn’t behave themelves at all. I felt helpless. i. Gradually,they got used to my smile and encouragement. The class became a lovely one. I was moved,and said , "Thank you for listening,boys and girls!" j. "Just awake the students with a smiling face"I said to myself.

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