D.Researchers have studied far more complex memories than the ones in the rat experiment.
【答案】
32A
33D
34B
35C
【解析】
33. D 细节排序题。根据第二段In the study, researcher first trained rats to remember which of two levers(杠杆) they pressed first, then to press the other lever.可知首先是e项:训练老鼠记住按住杠杆的顺序。根据第三段As the rats performed the task, the scientists carefully monitored the electrical activity in each creature’s hippocampus t可知是第二步是a项:记住老鼠脑部的电子活动;根据第四段they stimulated (刺激) nerves in the same pattern and found that the animals’ performance in the task got even better.可知第三步是C项:用同样的方法刺激老鼠的神经系统。根据第五段The scientists went a step further and suppressed the rats’ memories with a drug called Mk801, which caused them to forget their task.可知b是第四步:用MK801抑制老鼠的记忆。根据第五段最后一句When the animals’ brain cells were later stimulated with the“correct”pattern, they remembered again which lever to press.可知b项是最后一步:使用同样的方法来刺激老鼠的神经系统。故D项正确。
34. B 细节理解题。根据第四段第一句Using the same glass needles they had used to record the nerve activity, they stimulated (刺激) nerves in the same pattern and found that the animals’ performance in the task got even better.可知使用同样的方法刺激老鼠的神经系统时,发现老鼠的表现比之前更好。故B正确。
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