问题 选择题

如图是模拟电化学反应装置图。下列说法正确的是(  )

A.开关K置于N处,则铁电极的电极反应式为:Fe-2e=Fe2

B.开关K置于N处,可以减缓铁的腐蚀

C.开关K置于M处,则铁电极的电极反应式为:2Cl-2e=Cl2

D.开关K置于M处,电子从碳棒经开关K流向铁棒

答案

答案:B

开关K置于N处,构成电解池,铁电极为阴极,电极反应为2H2O+2e=H2↑+2OH,铁的腐蚀减缓;开关K置于M处,构成原电池,铁电极为负极,电极反应式为:Fe-2e=Fe2,电子从铁棒经开关K流向碳棒。

阅读理解

阅读理解。

     Jack is my new classmate. He lived in a small village for fifteen years. His father, Mr. Brown, was a rich

farmer. Last year his father opened a shop in our town and last month he bought a big house and Jack began

to study in our class. But Jack had few friends here. At first he often played by himself.

     Jack's neighbor Daisy is a kind girl. She found Jack never talked with anybody and decided to help him.

Jack likes to stay with Daisy and talks to her a lot. Now they're good friends.

     This morning, Daisy said to Jack, "It'll be my sixteenth birthday tomorrow. I'll have a birthday party. Will

you please come?"

      "Certainly!"

      Jack said happily. Jack got home and thought of a present for Daisy. But he forgot to ask Daisy what she

liked. He couldn't call her because he didn't know her telephone number. At that moment Mrs. Brown came

and asked, "What's the matter, dear?"

      "What would you like if it was your sixteenth birthday, Mommy?"

      "Nothing," Mrs. Brown said. "I just wish I were16."

1. Jack's father is a ______ now. [ ]

A. teacher

B. doctor

C. farmer

D. shopkeeper

2. Jack lives in a ______ now. [ ]

A. city

B. town

C. small village

D. small house

3. Jack will go to his ______ birthday party.[ ]

A. mother's

B. father's

C. friend's

D. sister's

4. Jack didn't know ______. [ ]

A. what Daisy looked like

B. Daisy's telephone number

C. The way to Daisy's house

D. when Daisy's party was

5. Jack's mother wanted ______. [ ]

A. some flowers

B. a friend

C. to be young

D. to be healthy

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