B. scientific research into babies; games is possible

　　C. the nature of babies’ play has been thoroughly investigated

　　D. a baby’s play is somehow similar to a scientist’s experiment

　　47.We learn from Paragraph 2 that

　　A. scientists and babies seem to observe the world differently

　　B. scientists and babies often interact with each other

　　C. babies are born with the knowledge of object support

　　D. babies seem to collect evidence just as scientists do

　　48. Children may learn the rules of language by

　　A. exploring the physical world

　　B. investigating human psychology

　　C. repeating their own experiments

　　D. observing their parents’ behaviors

　　49. What is the main idea of the last paragraph?

　　A. The world may be more clearly explained through children’s play.

　　B. Studying babies’ play may lead to a better understanding of science.

　　C. Children may have greater ability to figure out things than scientists.

　　D. One’s drive for scientific research may become stronger as he grows.

　　50. What is the author’s tone when he discusses the connection between scientists’ research and babies’ play?

　　A. Convincing.

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