题干

高考时,工作人员拿着金属探测仪对考生进行检查,以防止考生将手机等含有金属部分作弊工具带入考场(如图).当探测仪中的线圈靠近金属导体时,在金属导体内部就会产生一种特殊电流,从而触发报警.则探测仪的工作原理是(   )

A:电磁感应现象

B:磁场对电流的作用

C:电流的磁效应

D:磁极间的相互作用

上一题 下一题 0.0难度 选择题 更新时间:2019-11-06 03:10:56

答案(点此获取答案解析)

A

同类题3

故事续写。

    Twenty years ago, I drove a taxi for a living. One night I went to pick up a passenger at 2:30 a. m. When I arrived to collect, I found the building was dark except for a single light in a ground floor window.

    I walked to the door and knocked, "Just a minute," answered a weak, elderly voice.

    After a long time, the door opened. A small woman in her eighties stood before me. By her side was a small suitcase.

    I took the suitcase to the car, and then returned to help the woman. She took my arm and we walked slowly towards the car.

    She kept thanking me for my kindness. "It's nothing," I told her. "I just try to treat my passengers the way I would want my mother treated."

    "Oh, you're such a good man." She said. When we got into the taxi, she gave me an address, and then asked, "Could you drive through downtown?"

    "It's not the shortest way," I answered quickly.

    "Oh, I'm in no hurry," she said. "I'm on my way to a hospice (临终医院). I don't have any family left. The doctor says I don't have very long."

    I quietly reached over and shut off the meter (计价器). For the next two hours, we drove through the city. She showed me the building where she had once worked, the neighborhood where she had lived, and the furniture shop that had once been a ballroom where she had gone dancing as a girl.

    Sometimes she'd ask me to slow down in front of a particular building and would sit staring into the darkness, saying nothing.

At dawn, she suddenly said, "I'm tired. Let's go now." We drove in silence according to the address she had given me.

    "How much do I owe you?" she asked.

    "Nothing." I said.

    "You have to make a living," she answered. "Oh, there are other passengers," I answered. She said thanks to me, but she looked so sad.

注意:1.所续写的短文词数应为150左右;2.应使用5个以上短文中标有下划线的关键词语;3.续写部分分为二段, 每段的开头语已经为你写好;4.续写完成后, 请用下划线标出你所使用的关键词语。

Paragraph 1

    Almost without thinking, I bent and gave her a hug.

Paragraph 2

    I was on my way to visit her.