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House cats suffering from hyperthyroidism——A condition characterized by weight loss, hyperactivity and eventually heart disease——often show high blood levels of polybrominated diphenyl ether (PBDE), a chemical used as a fire retardant in rugs and furniture covers. Clearly the use of PBDE for this purpose can contribute to hyperthyroidism in house cats. Which of the following would, if true, most weakens the argument? A Any sensitivity to PBDE that a house cat may have is at least partly based on genetic factors. B Some animals other than house cats can develop hyperthyroidism when exposed to PBDE. C House cat sometimes develop hyperthyroidism even when not exposed to PBDE. D Some diseases other than hypothyroidism produce symptoms in house cats like those produced by hyperthyroidism. E The effects of hyperthyroidism in house cat include an inability to expel PBDE from the blood.
In an experiment, psychologists tracked the eye movements of adults and of infants from four to twelve months old watching a video of a woman speaking. The adults and the infants younger than six months mainly watched the woman's eyes, but the infants older than six months switched their attention between her eyes and her mouth. The psychologists concluded that lip-reading plays a role in how most infants learn language.
Which of the following would, if true, most strengthen the support for the psychologists' conclusion?
(A) Most infants start the process of learning language when they are about four months old.
(B) Watching people's eyes and facial expressions also plays a substantial role in how most infants learn language.
(C) Watching the woman's mouth did not help the adults or the youngest infants understand what she was saying.
(D) While watching the woman's lips, the infants older than six months repeated the vocal sounds she made then more often than those she made at other times.
(E) The infants generally paid closer attention to the video when the woman's mouth was concealed than when her eyes were concealed.
参考答案:ED
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