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问题 单项选择题 A1/A2型题

与M0型急性髓细胞性白血病在形态学上类似的是（）

A.M2a

B.M4

C.MDS

D.ALL-L2

E.ALL-L3

答案

参考答案：D

解析：

M0异常增生细胞在形态学上呈原始细胞特征，白血病细胞形态较小，亦可较大，胞质少，胞质可透亮或中度嗜碱，无嗜天青颗粒和Auer小体，核圆形，核仁明显，与ALL-L2类似。

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某校高三有1000 个学生，高二有1200 个学生，高一有1500 个学生，现按年级分层抽样，调查学生的视力情况，若高一抽取75 人，则全校共抽取（    ）
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Solving a problem can be broken down into several steps. First, the problem must be identified correctly. Psychologists refer (1) this step as problem representation. For many problems, figuring (2) which information is relevant and (3) is extraneous can be difficult and can interfere (4) arriving at a good solution. Clearly, before a problem can be solved, it must be obvious (5) the problem is, however, this is not as easy (6) it might seem. One obstacle to efficient problem representation is functional fixedness, that is, allowing preconceived notions and even prejudices (7) color the facts. Most people tend (8) see objects and events in certain fixed ways, and by being inflexible in viewing the problem, they may be unable to notice the tools (9) the solution. Once the problem is identified accurately, (10) , the second step consists (11) considering the alternatives for a solution. A common way to evaluate alternatives is to write them (12) and then make a list (13) advantages and disadvantages for each solution. Here again, people may be limited by prior experiences. Often people adopt mental sets (14) lead them to the same problem-solving strategies that were successful for problems (15) the past. Although that can be helpful most (16) the time, sometimes a new situation requires a different strategy. (17) that case, the mental set must be abandoned, (18) new alternatives must be explored.
After the alternatives have been compared, a strategy must be selected (19) among them. One way to avoid becoming mired in the options is (20) try the best option with a view to abandoning it for another (21) the results are unfavorable. This attitude allows many people to move on expeditiously (22) the next step—action. The strategy selected must be implemented and tested. If it solves the problem, no further action is necessary, but if (23) , then the cycle begins again, starting (24) problem identification. By continuing to review the problem (25) repeat the problem-solving steps, the solution can be improved upon and refined.
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