问题 不定项选择

如图甲所示,光滑导轨水平放置在与水平方向夹角60°斜向下的匀强磁场中,匀强磁场的磁感应强度B随时间的变化规律如图乙所示(规定斜向下为正方向),导体棒ab垂直导轨放置,除电阻R的阻值外,其余电阻不计,导体棒ab在水平外力作用下始终处于静止状态。规定a→b的方向为电流的正方向,水平向右的方向为外力的正方向,则在0~t时间内,能正确反映流过导体棒ab的电流i和导体棒ab所受水平外力F随时间t变化的图象是

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A.

B.

C.

D.

答案

答案:D

阅读理解

阅读理解

     I used to be frustrated when I got "trapped" in the train station in New York. When this happened,

I spent time "observing" people and found that the New York City trains formed "an underground

"NYC".

     I met all kinds of people there. Sitting in the trains coming from suburban like Queens and Brooklyn,

I saw babysitters and house keepers, in white or pink uniforms, carrying a shopping bag with lunch and

another prettier bag for their makeup. Some gentlemen in suits get squeezed in between ladies, reading

the New York Times, holding Starbucks coffees and a piece of napkin.  

     The passengers' skin color would get lighter as the train went from suburban areas to uptown NYC.

Clothes brands changed from "Nike" and "Babyphat" to "Armani" and "Prada".  

    Getting lost is not embarrassing at all. Even New Yorkers who have lived in the city for 20 years need

to check out the map before going to a new place by train. People from other states are just as confused

as foreigners when they are "thrown" underground.  

     It was funny when people carrying big backpacks and holding maps, asked me where they could

transfer while I was trying to find an exit. "I'm sorry; I am trying to find my way out too." I felt really bad

about not helping them. To my surprise, the two guys with blue eyes didn't look disappointed at all. They

laughed and told me, "Oh, we are wondering if there's really an exit because we have been walking

around here for 10 minutes and we still don't know where to transfer to the uptown train!"  

     NYC trains are just like doors rotating (旋转) on and on. If I hadn't got lost several times, I might not

have had the chance to stop and see what was happening outside my block.

1. According to the article, what kind of people has the author seen in the subway?

a.babysitters and housekeepers in uniforms

b.people wearing "Armani" and "Prada"

c.gentlemen with newspapers and maps

d.foreign women carrying a shopping bag with lunch and their makeup

e.foreigners checking out the map before going to new place by train

A. abc  

B. bcd  

C. cde  

D. abe

2. What can we infer from the third paragraph?

A. People of lighter skin color are less likely to live in the uptown NYC.

B. People in the suburban areas never wear "Armani" and "Prada".

C. People of different backgrounds travel by subway in NYC.

D. People of a better financial status usually don't take the subway.

3. Which of the following statement is TRUE about the author according to the article?

A. She found observing people in NYC trains quite frustrating.

B. She came to be grateful for the time when she lost her way in the subway.

C. She realized that only foreigners like her got trapped in the subway.

D. She was embarrassed when she had to ask the way in the subway.

4. What is the best title of the article?

A. An experience of taking the subway in NYC

B. The subway service in NYC

C. Busy life in uptown NYC

D. An Underground "NYC"  

填空题