英语完形填空How big is space?That is a question man has been askin

英语完形填空
How big is space?
That is a question man has been asking since the beginning of time.When your grandparents were in school,it was 36 that the Universe was very 37 perhaps only 5,000 light years 38.500 years ago people considered that the Universe was only a little bit 39 than the Earth.In modern times with the 40 of technology we are finally starting to 41 the immense (无边的) size of the Universe,and it is much bigger than anyone 42 have ever imagined.Scientists cannot stretch (伸展) a measuring tape from the Earth to a nearby star,so 43 do they know how far away they are?Scientists use something 44 Parallax (视差).Parallax means 45 that they look at how much the stars move in the sky 46 throughout the year as the Earth circles the Sun.This is not something 47 to you.In fact if you stretch out your hand in front of you and 48 your thumb,while 49 one eye,and then the other,your thumb will 50 to move back and forth.Stars do the 51 thing,but our eyes are too close to see the 52.However if we take a picture while on one side of Earth’s orbit,and then take another when we get to the 53 side of the orbit,then we have a large enough 54 that we can see the stars parallax,and 55 how far away they really are.36.A.measured B.said C.thought D.proved 37.A.old B.big C.mysterious D.small 38.A.over B.across C.through D.outsides 39.A.bigger B.smaller C.heavier D.nearer 40.A.popularity B.power C.energy D.strength 41.A.grasp B.control C.imagine D.feel 42.A.would B.should C.could D.might 43.A.what B.why C.how D.when 44.A.honored B.called C.considered D.believed 45.A.actually B.especially C.generally D.simply 46.A.in and out B.back and forth C.sooner or later D.up and down 47.A.unacceptable B.unfamiliar C.unbelievable D.unnatural 48.A.look at B.shake C.glare at D.notice 49.A.covering B.opening C.controlling D.hiding 50.A.continue B.happen C.stop D.appear 51.A.common B.different C.strange D.same 52.A.result B.effect C.difference D.similarity 53.A.suitable B.same C.opposite D.correct 54.A.distance B.length C.height D.width 55.A.realize B.determine C.recognize D.decide
第36个 为什么是 thought而不是A 第38个为什么用across 这里的用法是什么?有什么相关根据么?
滴41个为什么不是感觉呢 为什么是A 第45个为什么不是总体上而是仅仅?第46 跪了……

36,measured 意为测量,综合上下文,我们知道,宇宙的大小是根据理论估计出来的,而不是测量出来的数值.
38,across表示直径,只能用这个,其它与直径不符.
41,涉及科学不能用感觉,要用理论和数据说话,所以用“掌握”.
45,46,这句是解释视差：这里的视差就是地球绕太阳公转一周过程中,地球上的观察者看到的目标星所在方位的变化.这个变化可转变为地球在不同位置时,观察者与目标星之间连线的夹角（观察者相对地球的位置不变,因为天文台不会相对地球移位）.这个夹角的作用如下：设目标星在点C处,若在地球公转轨道上取两个点A、B,以A、B点连线为基线,调整基线的方向,使三角形ABC为等腰三角形,知道顶点夹角,地球公转轨道已知,A、B两点间的距离也可求出,相当于已知条件,最终可以求出腰长AC或BC,也就是地球到目标星的距离.当然,线段AB的长度越大,角ACB的角度就越大,求得的结果越精确.回到原句,45就是选simply,46,只有A符合题意,选A.
再问： 额 谢谢您 可惜最好就一个 感觉您的太牵强了……
再答： 是有点儿，没有从英语的语法来分析，而是单纯从文章内容出发来分析，看起来是有点牵强。