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问题 不定项选择

如图所示，在粗糙水平面上固定一点电荷Q，在M点无初速释放一带有恒定电量的小物块，小物块在Q的电场中运动到N点静止，则从M点运动到N点的过程中

[ ]

A．小物块所受电场力逐渐减小

B．小物块具有的电势能逐渐减小

C．M点的电势一定高于N点的电势

D．小物块电势能变化量的大小一定等于克服摩擦力做的功

答案

ABD

问答题

The writers: conference is a peculiarly American institution, combining an ethic of self reliance and self-improvement with the sunny conviction that all things worth having can be bought or taught. Writers’ conferences, like the M. F. A. programs and other writing courses that have spread in American universities since the middle of the 20th century—there are now upwards of two hundred and fifty of them—are predicated on the principle that the ability to write does not depend solely upon God-given talent but can be acquired. The price of a Bread Loaf education is eighteen hundred dollars for tuition and room and board, though about a third of the students receive scholarships. The most celebrated writers: program in the country, the Iowa Writers: Workshop, established the industry’s ruling metaphor, which is that writing is something like wood-working: you put on your apron, roll up your sleeves, and practice your craft. Iowa has also helped popularize an unfortunate neologism, "workshop" as a transitive verb, the use of which is endemic to a place like Bread Loaf (for example, the sentence "My writers’ group workshopped the hell out of this poem, but I still have to resolve some enjambment issues".)
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选择题

—Are we all here today?

—No, _____. [ ]

A. I am here          

B. everyone is here 

C. others are here    

D. some are not here

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