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问题 不定项选择

在真空中AB两点分别放有等量同种正电荷，在电场中通过AB两点的竖直平面内对称位置取一个矩形路径abcd，如图所示，则下列说法正确的是

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A．a、b两点电场强度相同

B．a、b两点电势相等

C．将一电子由a移到b，电子的电势能减少

D．将一电子由b移到c，电场力先做正功，后做负功

答案

BD

多项选择题

关于对股指期货投资者的诚信状况评估，下列说法正确的是（）。

A．期货公司会员应当通过中国期货业协会的投资者信用风险信息数据库，查询投资者相关信息

B．投资者只能提供近两个月内的中国人民银行征信中心个人信用报告作为诚信记录的证明

C．投资者可以提供近两个月内的中国人民银行征信中心个人信用报告或者其他信用证明文件作为诚信记录的证明

D．期货公司会员应当通过多种渠道了解投资者诚信信息，结合投资者个人信用报告等信用证明文件和中国期货业协会的投资者信用风险信息数据库的信息，对投资者的诚信状况进行综合评估
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填空题

Press Photographers


Good press photographers must have an "eye" for news, (26) journalists must have a "nose" for a good story. They must be able to interpret a story and decide rapidly how they can take (27) of the best opportunities to take pictures. The most difficult part of a press photographer’s job is that he or she has to be able to (28) a complicated situation with just one photograph. They rarely have second (29) and must be able to take the required (30) very quickly. Indeed, speed is essential — if the photographs are not (31) for the printing deadline, they are very unlikely to be of any (32) .
Most press photographers begin (33) with a local newspaper. There, the (34) is mostly for material of regional interest. Photographers may be expected to photograph a lot of unexciting events but to (35) the enthusiasm to put "something special" into every picture.
There is (36) competition among those who want to move from local to national newspapers. Here, the work is much more centered on news. The photographer must work (37) greater pressure and (38) more responsibility. Only (39) reliable, talented and resourceful photographers (40) this difficult move. The work is tough and can be (41) . On an overseas assignment, photographers may have to (42) unfamiliar food and accommodation, physical and mental stress, and (43) difficulty in transporting the pictures from an isolated area to get them to the newspaper (44) They also have to (45) the competition from other publications.

A. on time B. by the time C. for a time D. with time
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