At the beginning of this century, medical scientists made an interesting discovery; we are

At the beginning of this century, medical scientists made an interesting discovery; we are built not just of flesh and blood but also of time. They were 36 to show that we all have “a body clock” 37 us, which controls the 38 and fall of our body energies, 39 us different from one day one to the next.
The 40 of “a body clock” should not be too 41 since the lives of most living things are controlled 42 the 24 hour night-and-day cycle. We feel 43 and fall asleep at night and become 44 and energetic during the day. If the 24 hour-cycle is 45 , most people experience unpleasant 46 . For example, people who are not 47 to working at night can find that 48 of sleep causes them to 49 badly at work.
50 the daily cycle of sleeping and 51 , we also have other cycles which 52 longer than one day. Most of us would 53 that we feel good on some days and not so good on 54 ; sometimes our ideas seem to flow and at other times, they 55 do not exist.
36．A．anxious B．able C．careful D．proud
37．A．inside B．around C．between D．on
38．A．movement B．supply C．use D．rise
39．A．showing B．treating C．making D．changing
40．A．invention B．opinion C．story D．idea
41．A．difficult B．exciting C．surprising D．interesting
42．A．from B．by C．over D．during
43．A．dull B．tired C．dreamy D．peaceful
44．A．regular B．excited C．lively D．clear
45．A．disturbed B．shortened C．reset D．troubled
46．A．moments B．feelings C．senses D．effects
47．A．prevented B．allowed C．expected D．used
48．A．miss B．none C．lack D．need
49．A．perform B．show C．manage D．control
50．A．With B．As well as C．Except D．Rather than
51．A．working B．moving C．living D．waking
52．A．repeat B．remain C．last D．happen
53．A．agree B．believe C．realize D．allow
54．A．other B．the other C．all other D．others
55．A．just B．only C．still D．yet36---55 BADCD CBBCA BDCAB DCADA

(答案→)36---55 BADCD CBBCA BDCAB DCADA 解析：36 上文提到本世纪初，科学家们就已经发现人体不仅有血肉组成，还有时间。因此，根据这个发现，他们能够证明在人体内存在生物钟。be anxious to do渴望做某事，此处没有强调科学家的心理活动，故排除。37 根据常识及文中第一句we’re built not just of flesh and blood but also of time.可知答案。38 空格上所缺词应与and后面的fall 构成互补关系，才能较全面的概括人的活动。39 结合前一句话中的controls可知，生物钟能使我们每天的表现不一样。show 证明，展示，指示；treat对待；change使改变。如选change就意为使我们发生变化,与上下文意思不符。40 “生物钟”只是科学家经过研究而得出的一种结论或观点。41 根据空格后面的原因状语从句可知答案。42 大部分有生命的动物都受到日夜轮回这个时间循环的控制。43 结合常识可知，人工作一天,到晚上应是比较劳累。另外，后面的fall asleep 应是由劳累引起的。dreamy多梦的，不应出现在fall asleep之前。44 人休息了一晚上，第二天又充满了生机、活力。45 如果时间循环被打乱，大部分人就会不舒服。46 结合下一句的例子可知，此处应为人感到不舒服。47 be used to doing something习惯于……。上文中提到人的生物钟如被打乱，可能会感到不舒服。所以，如果不习惯于在晚上工作的人如果晚上工作，工作就会做不好。48 lack此处为名词，在从句中做主语，lack of…缺乏……。49 perform工作；表现。50 根据后面的also可得知答案。51 人类的日夜循环分为两段时间：即睡眠时的时间和醒着的时间。52 根据后面的longer than one day 可知，此处last意为持续。53 大部分人都有这种体验，都同意这种看法。54 上文提到了some days与之相对应的是other days即others。55 此处just用于否定句中表强调,它们根本就不存在。

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