memories.
Cirelli said that the Center's research began with this hypothesis (假设): We
sleep so that our brain can repair and refresh itself. She said the idea seems simple and reasonable. However, testing and discovering how it works has been extremely difficult.
Synapses are only about 20-40 nanometers wide. The team began their study by measuring the size of the synapses to look for changes in these already tiny spaces between difficult because “all the
nerve cells. Cirelli the process is said actual measurements of the synapses have to be done by hand.” The team had to wait until improvements in laboratory technology made it possible to see these tiny changes. A University of Wisconsin press release called the research a \job.\Many research specialists worked for four years to photograph, rebuild and study certain areas of a mouse brain.
Cirelli said they found that our synapses shrink as our brains clean themselves during sleep. We wake up refreshed and ready to fill those synapses with new information.
32. How does brain help improve our memory while sleeping?
A. By adding new knowledge to its old
collection. B. By not forgetting any learnt knowledge.
C. By repeating information learnt before. D. By keeping learning new information.
th
33. What is the 5paragraph mainly about?
A. The size of the synapses.
B. The time of the measuring work. C. The results of the measuring work.
D. The difficulties in the measuring work. 34. What can we infer about the research work?
A. The findings proved their hypothesis to be right. B. The team began their research as soon as they decided to. C. The synapses were found bigger after a good
night’s sleep. D. The researchers carried out their work with a mouse brain.
35. Which of the following can be the best title for the text?
A. Sleep helps the brain shrink. B. Sleep helps us keep healthy. C. Sleep helps us learn better.
D. Sleep helps clean our bodies. 第三部分：完形填空（共 20 小题；每小题 1 分，满分 20 分） 阅读下面短文，掌握其大
意，然后从各题所给的四个选项（A、B、C 和 D） 中 选出最佳选项。
Learn the power of words
One day, one of my children told me, “I hate you.” I have to 36 that I often say things that are unpopular. They may hate me, but as a responsible father, I’m certain I’m doing a 37 job.
There are three other 38 that I won’t allow in my house, however. Last
week, I was watching my older son play with a paper airplane. After he 39
threw it into a wall and it came apart, his eyes were soon 40 with tears. “I hate myself,” he said. I was 41 that he’d started to actually believe it.
I knelt down (跪下) next to him and made him look into my eyes. I told him
that I never wanted to 42 those words again, and that he needed to 43 himself.
The 44 between your kid telling you they hate you and them saying they hate 45 is that, five minutes later, they’ve already forgotten they “hate you.” But self-hate is much more 46 , and for young people, it can influence the rest of their lives.
Kids who start to believe they hate themselves 47 the chance to make a possible friend, because they assume they’ll be 48 . And as 49 , they might choose not to apply for that dream job because they assume it won’t 50 .
I know this 51 I didn’t have a high opinion of myself as a child. I found
myself 52 in many aspects, and I’d hate to see my children 53 the same.
Sometimes, words are just words. But some words can have the kind of 54
I’d very much like to avoid on my children. I don’t fear strong language; I fear
language that makes us 55 .
Great importance should be attached to speaking inspiring words. 36. A. realize B. permit C. allow D. admit 37. A. bad B. good C. familiar D. foolish 38. A. letters B. sentences C. words D. passages 39. A. happily B. surprisingly C. usually D.
accidentally 40. A. filled B. flowed C. covered D. rolled 41. A. glad
42. A. hear 43. A. ignore
44. A. similarity 45. A. themselves 46. A. useful 47. A. welcome 48. A. liked
B. worried B. watch B. charge B. result B. myself B. harmful B. create B. forgiven
C. excited C. feel C. respect C. harm
C. ourselves C. meaningless C. expect C. refused
D. calm D. notice D. move
D. difference D. yourself D. hopeful D. avoid D. joked
