2. 考研
  3. When lab rats sleep, their brains revisit the maze they navigated during the day, according to a new study (1)_____ yesterday, o

When lab rats sleep, their brains revisit the maze they navigated during the day, according to a new study (1)_____ yesterday, o

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问题     When lab rats sleep, their brains revisit the maze they navigated during the day, according to a new study (1)_____ yesterday, offering some of the strongest evidence (2)_____ that animals do indeed dream. Experiments with sleeping rats found that cells in the animals’ brains fire in a distinctive pattern (3)_____ the pattern that occurs when they are (4)_____ and trying to learn their way around a maze.
    Based on the results, the researchers concluded the rats were dreaming about the maze, (5)_____ reviewing what they had learned while awake to (6)_____ the memories.
    Researchers have long known that animals go (7)_____ the same types of sleep phases that people do, including rapid-eye-movement (REM) sleep, which is when people dream. But (8)_____ the occasional twitching, growling or barking that any dog owner has (9)_____ in his or her sleeping pet, there’s been (10)_____ direct evidence that animals (11)_____. If animals dream, it suggests they might have more (12)_____ mental functions than had been (13)_____.
    "We have as humans felt that this (14)_____ of memory—our ability to recall sequences of experiences—was something that was (15)_____ human", Wilson said. "The fact that we see this in rodents (16)_____ suggest they can evaluate their experience in a significant way. Animals may be (17)_____ about more than we had previously considered".
    The findings also provide new support for a leading theory for (18)_____ humans sleep—to solidify new learning. "People are now really nailing down the fact that the brain during sleep is (19)_____ its activity at least for the time immediately before sleep and almost undoubtedly using that review to (20)_____ or integrate those memories into more usable forms", said an assistant professor of psychiatry at Harvard Medical School.

选项 A、did
B、does
C、would
D、will
答案B
解析 由四个选项可知此处应填助动词。因为"The fact"是刚刚发现的客观现实，所以suggest不能用将来时，而且suggest这个动作是作者正在提出的观点，因此也不能用过去将来时，故只能用一般现在时，因此只有"does"正确。它用在这里起强调作用。
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