研究人员让老鼠呆在不同的迷宫中，并对它们大脑中海马区和视觉中_爱下问搜题

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问题单项选择题

研究人员让老鼠呆在不同的迷宫中，并对它们大脑中海马区和视觉中心的活动情况进行了测量。结果显示，当所处的迷宫发生变化时，老鼠大脑中上述区域的活动情况也发生了变化。之后，当老鼠处于睡眠状态时，科学家们又对它们的大脑进行了重复测量。结果显示，老鼠大脑中所反映出的“生活场景”恰好是它们在迷宫中奔跑时所看到的。
研究人员从中得到的最终结论应该是( )。

A．老鼠的大脑活动是由海马区和视觉中心控制的
B．老鼠处于睡眠状态时，大脑仍然很活跃
C．老鼠在不同的实验迷宫总会有不同的大脑活动
D．老鼠的梦是它所见到的某些生活场景的反映

答案

参考答案：D

解析： A、B、C三个选项都不是这两个对比实验所得出的结论，只是分别对某一个实验的结果负责，只有D项结论是综合这两个对比实验分析所得出的结论。故选D。

选择题

聚乙炔导电聚合物的合成使高分子材料进入了“合成金属”和塑料电子学时代，当聚乙炔分子带上药物、氨基酸等分子片段后，就具有了一定的生物活性。以下是我国化学家近年来合成的聚乙炔衍生物分子M的结构式及M在稀硫酸作用下的水解过程如下图

下列有关说法中不正确的是（）

A．M、A均能使酸性高锰酸钾溶液和溴水褪色

B．B中含有羧基和羟基两种官能团，B能发生消去反应和酯化反应

C．1molM与热的烧碱溶液反应，可消耗2n mol的NaOH

D．A、B、C各1mol分别与金属钠反应，放出的气体的物质的量之比为1:2:2

完形填空

On August 26, 1999, New York City experienced a torrential downpour. The rain caused the streets to ____ and the subway system almost came to a stop.
Unfortunately, this happened during the morning rush hour. Many people who were going to work were ____ to go home. Some battled to ____ a taxi or to get on a bus. Still others faced the ____ bravely, walking miles to get to work.
I ____ to be one of the people on the way to work that morning. I went from subway line to subway line only to find that most ____ had stopped. After making my way ____ crowds of people, I finally found a subway line that was ____. Unfortunately, there were so many people waiting to ____ the subway that I could not even get down the stairs to the ____. So I took the train going in the opposite direction, and then switch back to the downtown train. Finally, after what seemed like a forever, the train ____ my stop. Then I had to walk several blocks in the increasingly heavy rain. When I finally got to my office, I was ____ through, exhausted and ____.
My co-workers and I spent most of the day drying off. When it was 5:00 pm，I was ready to go home. I was about to turn off my computer ____ I received an email from Garth, my Director:
I would like to thank all of you who made the effort and __ __ reported to work. It is always reassuring(令人欣慰), at times like these, when employees so clearly show their ____ to their jobs. Thank you.
Garth’s email was short, but I learned more from that ____ message than I ever did from a textbook. The email taught me that a few words of ____ can make a big difference. The rainstorm and the traffic ____ had made me tired and upset. But Garth’s words immediately____ me and put a smile back on my face.

B．discouraged

B．appreciation