3.C　推理判断题。根据第二段的内容可知,研究者变换了对婴儿的刺激方式,是为了更深入地进行研究。故选C项。

　　4.D　推理判断题。本文介绍了对婴儿进行的试验、试验的经过、结果等,因此本文可能来自于一份科学报告。故选D项。

　　【长难句子分析】

　　当正方形上的数字由两个变成三个或由三个变成两个时,婴儿就更多地注意屏幕上任意移动的正方形。

　　（2016高考阅读理解）阅读下列短文，从每题所给的选项中选出最佳选项。

　　One morning the old Water­rat put his head out of his hole.The little ducks were swimming about in the pond，and their mother，who was pure white with real red legs，was trying to teach them how to stand on their heads in the water.

　　“You will never be in the best society unless you can stand on your heads，” she kept saying to them；and every now and then she showed them how it was done.But the little ducks paid no attention to her.They were so young that they did not know what an advantage it is to be in society at all.

　　“What disobedient children！”cried the old Water­rat，“they really deserve to be drowned.”

　　“Nothing of the kind，” answered the Duck，“everyone must make a beginning，and parents cannot be too patient.”

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