D. the number of objects
7. Why did the researchers test the babies with drumbeats?
A. To reduce the difficulty of the experiment.
B. To see how babies recognize sounds.
C. To carry their experiment further.
D. To keep the babies' interest.
8. Where does this text probably come from?
A. Science fiction.
B. Children's literature.
C. An advertisement.
D. A science report.
[文章大意] 刚刚出生的婴儿对眼前出现的不同图片和物体的数量有没有概念呢?他们对视觉和声音的变化敏感吗?对此,研究者进行了一系列的试验。
5.B。考查推理判断。根据第一段中的“Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced.”可知,第一段描述的试验主要针对的是婴儿的视觉(sense of sight)。
6.D。考查细节理解。根据第一段中的“until a third, with three black spots, is presented. Her gaze returns: she looks at it for twice as long as she did at the previous card.”可知,当图片上物体的数量发生变化时,婴儿注视图片的时间增加了一倍。由此可知,婴儿对物体数量的变化非常敏感。
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