Or do newborns simply prefer more to fewer? The same experiment, but with three spots shown before two, shows the same return of interest when the number of spots changes. Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects (a comb, a key, an orange and so on), changing the number of objects had an effect separate from changing the objects themselves. Could it be the pattern that two things make, as opposed to three? No again. Babies paid more attention to squares moving randomly on a screen when their number changed from two to three, or three to two. The effect even crosses between senses. Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two; likewise（同样地）when the researchers started with drumbeats and moved to spots.

　　1．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

　　2．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 babes interest.

　　3．Where does this text probably come from?

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