A. a ball

　　B. a teddy

　　C. a car

　　D. a doll

　　50. What can we infer from Paragraph 3?

　　A. Nine-month-old baby boys don’t play with dolls at all.

　　B. Two-year-old baby girls sometimes play with cars and balls.

　　C. The older the babies are, the more obvious their preference is.

　　D. Parents should teach their babies to share each other’s toys.

　　51. What conclusion did Dr. Brenda Todd draw from the results of the study?

　　A. Adults purposely influence their babies’ preference.

　　B. Babies’ preference isn’t affected by social surroundings.

　　C. Baby boys preferring to moving toys will be good at hunting.

　　D. Baby girls preferring warmer colors will be warm-hearted.

　　E

　　A new argument has been put forward as to whether penguins are disturbed by the presence of tourists in Antarctica.

　　Previous research by scientists from Keil University in Germany monitored Adelie penguins and noted that the birds’ heart rates increased dramatically at the sight of a human as far as 30 meters away. But new research using an artificial egg, which is equipped to measure heart rates, disputes this. Scientists from the Scott Polar Research Institute at Cambridge say that a slow moving human who does not approach the nest too closely, is not viewed as a threat by penguins.

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