首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
According to the experiments, many blind people________.
According to the experiments, many blind people________.
admin
2013-07-09
65
问题
According to the experiments, many blind people________.
Did you ever wonder why it is that most people are"programmed" to sleep at night instead of during the day? If there’s something about the cycle of light and dark that’s telling us when to sleep, then shouldn’t the sleep cycle of a blind person be different? (14)It turns out that many blind people do have the same sleep cycle as sighted people. How can this happen? The answer is: hormones—one hormone called melatonin in particular. (15)In sighted people, the level of melatonin goes up at night or when it’s dark and goes down in the day or when it’s light. It’s believed that it’s the presence of this hormone in the blood that gives us the urge to sleep. If an increase in melatonin level "programs" sighted people to sleep at night, then what about blind people? A researcher named Dr. Charles Czeisler tells about an interesting experiment. He tried shining a bright light into the eyes of some blind people. (16) When he did this, he noticed that the level of the melatonin in the blood of these subjects went down—just as it would do for sighted people. Somehow, the eyes of these subjects, even though they were damaged and had no visual perception of light, could tell their brain when there was more or less light. However, this doesn’t work for all blind people. Further research may be able to explain this sensitivity to light in terms of the type of blindness of the subject.
选项
A、sleep at daytime
B、can sleep at any time
C、have different sleep cycle with sighted people
D、have the same sleep cycle as sighted people
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/C4QK777K
0
专业英语四级
相关试题推荐
Theyaretalkingvigorouslyaboutthepeopleandcountries______theyhadvisited.
Thenorth-east,with60millionpeople,isthemost______populatedpartoftheUnitedStates.
Somepeopleeither______avoidquestionsofrightandwrongorjustremainneutralaboutthem.
Altogether,howmanypeoplearesaidtobeinjuredintheaccident?
ItiscommonlybelievedintheUnitedStatesthatschooliswherepeoplegotogetaneducation.Nevertheless,ithasbeensaid
ItiscommonlybelievedintheUnitedStatesthatschooliswherepeoplegotogetaneducation.Nevertheless,ithasbeensaid
随机试题
硬膜外隙内容物()
流行性出血热的基本病变是()
患者,男,52岁,慢性乙型肝炎病史6年,1个月前出现皮肤金黄色。查体:肝掌、蜘蛛痣。下列各项化验检查结果不正确的是
颈椎右前斜位摄影,应观察
生产车间用于组织和管理生产的费用,应计入()科目。
甲因聚众赌博被带至派出所询问,过程中突然冒汗、呼吸急促,甲手捂胸口表示身体严重不适。警察乙、丙见甲不能回答问题,遂端了杯水给甲,决定等其稳定后再询问。但2小时后,甲已不见动静。事后查明,甲因紧张焦虑导致心脏病发作死亡。关于本案,下列说法正确的是()
科学技术是生产力,其意是说()。
唐代诗人顾况写道:“冬青树上挂凌霄,岁晏花凋树不凋。凡物各自有根本,种禾终不生豆苗。”这首诗蕴含的哲理有()
A1993studyshowingthatstudentswhodidreasoningtestswhilelisteningtothe1781SonataforTwoPianosinDbyMozarttend
Theteaceremonyduringaweddingservesasameansforbothpartiestomeetwitheachother.AsChinesefamiliescanberather
最新回复
(
0
)