word页脚2021年柳州八中高三英语期末考试试题及答案解析
陆的组词第一部分 阅读（共两节，满分40分）
第一节（共15小题；每小题2分，满分30分）
阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项
A
描写月亮的好句Three Things to Do Before You Are 18
Are you bored with your daily life? Here are some things you should try before you are 18.
★Learn to swim
Seriously, this is so important that it can save your life. If you can’t swim well, you won’t be able to dowater sports like waterskiing, surfing and diving. Even taking a boat trip will be dangerous for you. Make sure you do it.
★Try at least one kind of team sports
Being a good team player is an important skill in life. You can’t just think of yourlf, but have to work well with other people. Other advantages of team sports like basketball, football and baball are that they keep you fit and healthy, and they are also great fun. Teams usually have a good social life too—you’ll go to lots of parties and make many friends.
★Collect something
手抄报
One of the best hobbies for under-18s is collecting things. You could collect kinds of stamps, or you could collect things that make you remember what you have done, like cinema tickets for films you have en or letters from friends. The best way to collect is to have a special album to put your collection in and to write what each thing means to you. That way you won’t forget.
1. The most important reason for learning to swim is that ________.
A. you might feel well B. it can make you healthy
C. you might easily do lots of things D. it can save your life
2. The writer tells us that one of the best hobbies is to ________ .
A. collect something B. do some water sports
C. nd letters to your friends D. play basketball with your friends
23. The passage is mainly about ________before you are 18.
A. good habits to keep B. skills to have
C. things to do D. sports to play
B
Brain cells work to actively forget memories during a specific period of sleep. When we sleep our brains clear out the memories we’ve made while we’re awake, deciding what to keep and what to get rid of. Forgetting is an active process, explained the authors of the s
tudy published in the journal Science. But less is known about this process during the different periods of sleep.
They found that during the rapid eye movement (REM ) sleep period — or active sleep when we are thought to dream — special nerve cells appear to actively contribute to forgetting. What are known as melanin-concentrating hormone-producing (MCH) neurons (神经元) sit in the hypothalamus (下丘脑): a part of the brain which helps with a range of functions such as sleep, appetite and emotions. Past rearch has suggested the cells help to control REM sleep patterns: activating the MCH neurons increasing time spentin this period, while preventingthemreducing changes into this period.
The scientists looked at MCH cells in mice, and found 52.8 percent were active during REM sleep, compared with 35 percent when the mice were awake. Study co-author Thomas Kilduff, director of the Center for Neuroscience at SRI International, told Newsweek the team was surprid to find that mice performed better on learning and memory tasks when the MCH cells were prevented. “This result suggests that activation
of the MCH neurons may affect memory — that is, MCH neurons may facilitate forgetting,” Kilduff explained.
When asked what motivated the study, Kilduff said, “We hope the work could deepen our understanding of Alzheimer’s dia. Understanding the neural basis of learning and memory is a huge area of neuroscience rearch becau of its effects on our everyday lives, as well as dias such as Alzheimer’s dia. Prior to this work, no one suspected that MCH neurons had anything to do with forgetting,” said Kilduff.
流浪神狗人4. What can we infer from paragraph 1?
A. Forgetting is a passive process.
B. The forgetting process is known to us.
C. Some memories are forgotten while we are awake.
D. Certain memories are removed while we are asleep.
5. What does the underlined word “them” in paragraph 2 refer to?
A. REM sleep patterns.
B. Past rearches.
C. MCH neurons.
D. A range of functions.
6. Why did Kilduff’s team conduct the rearch?鼻孔一大一小
A. To publish the study in the journal Science.
B. To know more about Alzheimer’s dia.
清世宗雍正
C. To contribute to human’s forgetting.
D. To explore our everyday lives.
7. What can we know about MCH?
A. MCH cells takes control of REM sleep patterns .
B. MCH neurons may disturb memory consolidation.
C. MCH neurons have nothing to do with forgetting.
D. MCH cells help mice performing better on learning.
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C
