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使用托盘天平测量物体的质量前，要对天平进行调节。某同学调节天平时未将游码放在标尺左端的零刻度处，测量的结果将 ()

A.偏大;
B.偏小
C.正常
D.无法确定

【参考答案】

A

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听力原文：W: Hey Steve, got any plans for tonight? M: Hi, Jane. No, I don't think so. Why? Got any suggestions? W: In fact, I do. I just got two tickets to the opening of the exhibit of the reprints by Julia Margaret Cameron. I would have to mention it earlier, but I was on the waiting list for these tickets and I wasn't sure I'd even get them. M: An exhibit, huh? I like such things. But I don't know who Julia…… W: Margaret Cameron! She was a photographer in the 1800s. She is interesting to art-historians in general and students of photography in particular because she ... how should I say, change the aesthetics for photography. M: What do you mean? W: Well, her specialty was portraits and instead of just making a factual record of details like most photographers did, you know, just capturing what a person look like in a dispassionate（平心静气的）thought of way. She, like a portrait painter, was interested in capturing her subject's personality. M: Interesting! How did she do that? W: She invented a number of techniques that affect the picture. Like one of these things she did was blur images slightly by using a soft focus on the subject. That's pretty common now. M: Yeah, seen that. Who did she photograph? W: Famous people of her day, Alfred Lord Tennyson, Henry Wadsworth Longfellow, Charles Darwin, I don't know who else. We'll see at the exhibition. M: You really pick my curiosity. I am going to enjoy this.(31)A．A famous photographer.B．Photographic processes in the 1800's.C．Photographic equipment used in the 1800's.D．A new museum.

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