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问题 单项选择题

赵明能根据A>B，B>C，则A>C的原理，推出A、B、C的关系，比如“小张比小李高，小李比小王高，则小张最高。”根据皮亚杰的认知发展理论，赵明的认知发展处于（　　）阶段。

A．感知运动

B．前运算

C．具体运算

D．形式运算

答案

参考答案：C

解析：具体运算阶段(七至十一岁)，出现了逻辑思维和零散的可逆运算，但一般只能对具体事物或形象进行运算。赵明的推理说明他具有了一般的逻辑思维能力，因而答案是C。

单项选择题

根据短文内容，从方框中选出能填入空白处的最佳选项。(选项中有两项为多余选项) Saying Goodbye Many people were waiting for the train. Some were reading newspapers and some were saying goodbye to their friend． Doctor Smith, Mr. Lee and Mr. Brown were talking so happily that ____16____ Then the guard called loudly, “The train is going to leave. ____17____ The three men heard the guard and two of them jumped onto the train quickly before it moved. One was left behind. It was Dr. Smith. He ____18____ The guard came to him and said, “Don’t worry. ____19____ ”“I know.” Dr Smith said，“ ____20____ My friends only came to say goodbye to me. ” A. But it is my train. B. they didn’t know the train was going to leave. C. was very excited. D. Hurry up, please. E. looked very sad. F. The next train will come in ten minutes. G. Take your time.
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单项选择题

吞服腐蚀性剂后最早出现和最明显的症状为

A．口腔、咽喉、胸骨后及上腹部剧痛
B．咽下困难、恶心、呕吐
C．食管或胃穿孔
D．休克
E．呕血
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