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  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、in circles
B、in accord
C、in case
D、in essence
答案D
解析 不难判断空白后的"reviewing what they had learned..."是对空白前的"dreaming about the maze"的进一步解释，故in essence(实质上)正确。句意：根据这些研究成果，研究人员断定，老鼠梦见迷宫，实质上是回顾它们醒着的时候走迷宫的过程以增强记忆。这个分词短语进一步说明了研究人员的看法。in circles=in a circle在原地兜圈子，毫无进展；in accord与with连用，意为"与…一致"；in case万一。这三项用在这里不合逻辑，无法表达出文中的解释作用。
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考研英语一

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