题干

在一堂物理活动课中,同学们正以“假如失去…”为主题展开讨论.以下是由四位同学提出的具有代表性的观点,你认为正确的是(  )

A:假如失去了摩擦力,任何物体都不可能处于静止状态

B:假如导体都失去了电阻,那么所有的用电器都不能正常工作

C:假如失去了重力,天平就不能再用来测量物体的质量

D:假如磁体周围失去了磁场,世界上就不会有电的产生

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答案(点此获取答案解析)

C

同类题2

根据短文内容,从 A、B、C、D 四个选项中选出一个最佳答案,并把答题卡上对应题目的答案 标号涂黑。
    Do you often communicate with your parents? Some parents are always comparing their1with themselves when they were young or with other people when they were children.
    "When I was your age," a father said to his sixteen-year-old son one day, "I was at the top of my class every year. And I2what I wanted to do when I left school. I had goals (目标). You are always at the bottom (最后) of your class3you have no goals."
    The man's son said nothing. He had already heard this from his father many times. "And when your mother was your age, " the young man's father4, " she had a good job and she5lots of money. You don't even have a part-time job .You earn nothing. " The man's son still said nothing. He had heard this before, too. "
    And when your6brother was your age, "the young man's father said, "he studied hard. But you just waste your time."
And the man's son still said nothing.
     Finally, the young man's father said, "And when Abraham Lincoln was your age, he worked all day and studied at night."
This time the son7stay silent. "
    And when Abraham Lincoln was your age, father," he said, "He was the President of8United States.9are you?"
    His father had no answer10this.
    Are your parents always comparing you with others? And what’s your reply? Do you have a better way to communicate with each other?