61.Babies are sensitive to the change in______.
(A) the size of cards.
(B) the colour of pictures.
(C) the shape of patterns.
(D) the number of objects.

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#1204035
细节题。还是看第一段，As the cards change from one to the other,her gaze(凝视) starts to lose its focus - 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.卡片改变时，直到出现3个黑点纸板时，婴儿又开始集中注视了。由此可知，婴儿对于有不同数目黑点的纸板比较敏感。
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