问题 选择题

在图所示的电路中,当电键K闭合后,电流表A的示数为零,电压表V1的示数为6V,电压表V2的示数为零。导线、电表、电键及各接线处均无问题,这说明断路的是:( )

A.电阻

B.电阻

C.电阻

D.串联电池组

答案

答案:A

题目分析:开关闭合后,电流没有读数,说明线路中有断路。电压表有读数,说明此处断路,没有读数,说明此路正常,因此根据题意,有断路之处应该为R1,答案为A

点评:此类题型考察了根据电压表如何判断电路故障的方法

多项选择题
阅读理解

(Q =" Question;" A = Answer)

Situation I

Q: If someone sits right next to me in an empty movie theater, is it rude to move?

A: Maybe, but nobody will fault you for it. Chances are that close sitter doesn't realize he disturbs you, so he may miss your annoyance. You undoubtedly aren't the first person he's met who needs enough room. Forgive his bad judgment, move quietly and enjoy the show.

Situation II

Q: If I use the bathroom at a store, do I need to buy something?

A: Consider frequency and urgency. Is this a one-time or an emergency? If so, you don't have to buy anything, but it would be kind if you did. However, if you regularly use the bathroom at this place, then you are a customer, and you should act like one.

Situation III

Q: If someone is talking loudly on the bus, is there a nice way to ask him to keep it down?

A: No. Try other means.1) Stare at him until he gets aware of it and quiets down. 2) Lift your finger in a silence motion(动作)and smile. 3) Put on earphones and ignore him.

Situation IV

Q: If I remember my friend's birthday a day late, should I apologize or just wish her a happy birthday like nothing happened?

A: This is the reason why the word belated was invented. "Happy belated birthday!" is short for: "Well, I know I forgot, but then I remembered. Forgive me and happy birthday."

Situation V

Q: Can I lie about seeing a text because I was too busy or lazy to respond(回复) to it?

A: Don't lie. Receiving a text does not mean you need to respond to it. Why waste a perfectly good lie when the truth will serve? "Yes," you can say if ever asked, "I saw it." No explanation is needed as to why you don't respond.

小题1:You will get annoyed in a theater when         .

A.a person is too active

B.a person is too rude to you

C.a person talks too loudly

D.a person sits too close to you小题2:How will you quiet someone down in a public place?

A.By making fun of him continuously.

B.By looking purposefully at him.

C.By talking to him directly.

D.By pointing angrily at him.小题3:The underlined word "belated" in Situation IV probably means      .

A.predicted

B.returned

C.cancelled

D.delayed小题4:What is the passage mainly about?

A.Modern ways to mind your manners.

B.Different ways to change others' manners.

C.Proper manners to offer help to others.

D.Good manners to talk to people.