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1、Section The Language Points of Reading课时作业(一)完形填空Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts _1_ our protective blanket on _2_. Light gets through, and this is essential _3_ plants to make the food whic
2、h we _4_. Heat, _5_， makes our environment tolerable and some ultraviolet (紫外线的) rays penetrate the _6_. Cosmic (宇宙的) rays of various kinds come _7_ the air from outer space, but _8_ quantities of radiation from the sun are screened off. _9_ men leave the atmosphere they are _10_ to this radiation,
3、_11_ their spacesuits or the walls of their spacecraft, if they are inside, _12_ prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in _13_. Doses of radiation are measured in _14_ called “rem (雷姆)”. We all _15_ radiation here on earth from the sun，from cosmic ray
4、s and from radioactive minerals. The “_16_” dose of radiation that we receive each year is about two millirems. It _17_ according to where you live, and this is a very rough estimate. Scientists have the reason to think _18_ a man can _19_ far more radiation _20_ 0.1 rem without being damaged. The f
5、igure of 60 rems has been agreed on.篇章导读：本文是一篇说明文。太阳和其他星体发出的射线对人类既有利又有弊，那么大气层对此又是如何起作用的呢？人们能承受的安全射线数是多少雷姆呢？1A.for Bwith Con Das答案：Dact as “充当，起作用”。句意：大气层再次对我们起到防护的作用。2A.stars Bsun Cearth Dspace答案：C由上题可知，大气层起到防护的作用，保护的应该是地球。故选C项。3A.with Bfrom Cunder Dfor答案：Dbe essential for “对来说是首要的/基础的”，为固定搭配。4A.use
6、 Blive Ceat Dget答案：C由常识可知，植物依靠阳光来生长出我们吃的食物，故选C项。5A.again Balso Cbesides Dtoo答案：Dalso一般紧跟动词；besides一般用在句首；too可用在句中，用逗号隔开。此处指热量也使得我们的生活环境温度适宜。6A.environment Bspace Catmosphere Dearth答案：C由第1空所在的句子可知，地球周围有大气防护层，因此推知这里紫外线穿透大气层。故选C。7A.across Bto Cfrom Dthrough答案：D这里的come through相当于penetrate“穿透”。come acros
7、s “偶遇”；come to “来到”；come from “来自”。句意：各类来自外太空的宇宙射线穿透大气层。故选through。8A.valid Benormous Cvarious Dproper答案：B由空格前but表转折和句末的“are screened off (被隔开)”可判断此处表述大量的来自太阳的辐射被隔离掉了。valid “有效的”；various “各种各样的”；proper “合适的”。enormous “大量的”符合文意。9A.As soon as BAs well as CAs much as DAs possible as答案：Aas soon as “一就”。此
8、处表述人一离开大气层就会接触到射线。故选A项。10A.shown Bexposed Cfaced Dcovered答案：Bbe exposed to “暴露于”，符合语意。11A.but Bbecause Cso Dso that答案：A本句前半句的意思：人一离开大气层就会接触到射线；后半句的意思：他们的太空服和太空船的外壁会阻止射线造成的损害。前后应该是转折关系，故用but。12A.get Bmake Chave Ddo答案：D“do动词原形”结构强调谓语动词。13A.Mars Batmosphere Cspace Dplanet答案：C由Radiation和explorers可推测，应选s
9、pace (太空)。句意：射线是探险者在太空中所知的最大危险。14A.pieces Bunits Cparts Dsystems答案：B此处表述射线的剂量可用“雷姆”这个测量单位来测量，故选B项。15A.receive Baccept Cbring Dcatch答案：A由第16空所在句子中的“radiation that we receive each year”可知，此处表示受到辐射，故选A项。16A.conventional Bcommon Cgeneral Dnormal答案：D此处表述我们每年接受的正常辐射量大约为2毫雷姆。故选normal。17A.puzzles Bfloats Cc
10、ombines Dchanges答案：D由句意“所处地点不同，所能承受的正常的辐射量也不一样”可确定答案为D项。18A.what Bwhich Cthat Dwhy答案：C本句应填入引导宾语从句的连接词，而从句不缺少成分和语意，故选择that。19A.put up with Bkeep up with Ccome up with Dcatch up with答案：A此处表述人类可承受的辐射量。put up with “忍受”，符合语境。20A.from Bthan Cas Daway答案：B由前面的“more”和后一句中的“The figure of 60 rems”可知，应选than，表示“
11、远超0.1雷姆的辐射量”。阅读理解AEdmund Halley was an English scientist who lived over 200 years ago. He studied the observations of comets (彗星) which other scientists had made. The orbit of one particular comet was a very difficult mathematical problem. He could not figure it out. Neither could other scientists w
12、ho dealt with such problems.However, Halley had a friend named Newton, who was a brilliant mathematician. Newton thought he had already worked out that problem，but he could not find the papers on which he had done it. He told Halley that the orbit of a comet had the shape of an ellipse (椭圆)Now Halle
13、y set to work. He figured out the orbits of some of the comets that had been observed by scientists. He made a surprising discovery. The comets that had appeared in the years 1531, 1607, and 1682 all had the same orbit. Yet their appearances had been 75 to 76 years apart.This seemed very strange to
14、Halley. The different comets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different comets, as people thought. He decided that they had simply seen the same comet three times. The comet had gone away and had come back again.It was an astonishing idea! Halley felt certain enough to make a prediction of what comet would happen in the future. He decided that this comet would appear in the year 1758. There were 53 years to go before Halleys prediction could be tested. In 1758
