问题 多选题

如图,左侧接有定值电阻的光滑导轨处于垂直纸面向外的匀强磁场中,导轨间距为L,质量为m阻值不计的金属棒由静止开始在恒定拉力F作用下从CD处沿导轨向左加速运动。从金属棒开始运动起,磁感强度随时间变化关系为Bkt,当金属棒移动距离d至磁场右边界EF,磁场磁感强度即保持不变,恰能使金属棒在磁场中作匀速直线运动。匀强磁场区域中GH与EF相距为2d。下列判断正确的是

[ ]

A.金属棒进入磁场前后回路中感应电流方向不变

B.当磁场保持不变后磁感强度大小Bk

C.导轨左侧定值电阻阻值Rk2L2

D.金属棒从CD运动至GH过程中全电路产生的焦耳热为Q=2Fd

答案

BC

阅读理解

"Regardless of social class, race and age, men say they hate to shop." says Zukin, City University of New York sociology professor. "Yet when you ask them deeper questions, it turns out that they like to shop. Men generally like to shop for books, music and hardware. But if you ask them about the shopping they do for books or music, they'll say, "Well, that's not shopping. That's research. "

In other words, what men and women call "buying things" and how they approach that task are different.

Women will wander through several 1,000-aquare-meter stores in search of the perfect party dress. Men will wander through 100 Internet sites in search of the perfect digital camcorder. Women see shopping as a social event. Men see it as a special task or a game to be won.

"Men are frequently shopping to win," says Ann, a marketing professor at Loyola University of Chicago. "They want to get the best deal. They want to get the best one, the latest one and if they do that it makes them happy. "When women shop, "They're doing it in a way that they want everybody to be very happy." says Ann. "They're kind of shopping for love."

"Teenage girls learn to shop from their moms and older sisters, but they also learn to shop by examining articles in magazines like Seventeen, "City University Zukin says." And although men's magazines such as GQ and Esquire have long had shopping articles, it's TV that has the eye of young male shoppers, "say Ann and Zukin.

"Television shows are used by young men in the same way Seventeen magazine or Lucky is used by girls," says Zukin, "to help make clothing and toiletry choices."

"Of course, there are men who love to shop and are proud of it." Loyola's Ann says. And that is important no matter whether you buy a car or a frying pan. All men love to buy but don't want to get cheated. Ann adds, "There actually are men who are interested, for example, in cooking or shopping or chinaware or things around the home-----they become kind of girl magnets. Women like it."

小题1:From the first paragraph we can find that _____.

A.men are all dishonest

B.men are all book-lovers

C.men hate to shop actually

D.men like to shop in fact小题2:Compared to women, men usually treat shopping _____.

A.honestly

B.seriously

C.frequently

D.foolishly小题3:As is shown in this passage, teenage girls go shopping _____.

A.only with their moms

B.only with their sisters

C.often following magazines

D.often following TV shows小题4:The underlined word "magnets" in the last paragraph means _____.

A.magazines that attract young women

B.persons that have a powerful attraction

C.tools that can help housewives much

D.vegetables that make women beautiful

单项选择题