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1、单元加餐练（一）（二）加餐练(一)完形阅读组合练.完形填空For thousands of millions of years the moon has been going round the earth. During this time, the moon has been the _1_ satellite of the earth. Today, _2_，the earth has many other satellites all _3_ by man. These manmade satellites are very much smaller than the moon. Ho
2、wever, some of them will still be going _4_ the earth thousands of years from now.Manmade satellites do not _5_ because they are going too fast to do so. As they speed along, they _6_ to go straight off into space. They _7_ out of the earth, or its gravity, which _8_ them from doing this. As a resul
3、t, they travel in an orbit round the earth.If a manmade satellite travels about at a certain height, it can keep going _9_ round the earth, just like the moon. This is _10_ it is above the atmosphere, and there is nothing to _11_ it down. If it travels _12_ than that, it will be slowed down so much
4、that it will _13_ the earth.Men have _14_ spaceships to the moon and to the two _15_ planets: Mars (火星) and Venus (金星). By putting a camera on _16_ the spaceship to the moon, men have been able to _17_ photographs of the other side of the moon. This side is always _18_ from us as the moon circles th
5、e earth. The _19_ are later transmitted by radio to the earth. They showed that the other side of the _20_ is very much the same as the side that turns towards us.语篇解读：在人造卫星出现之前，月亮是地球唯一的卫星。人造卫星能在太空中正常运转的原因是它位于大气之上，如果运行高度下降的话，卫星就会掉下来。1A.biggestBbrightestClast Donly解析：选D从下文可知，在人造卫星出现之前，月亮是地球唯一的卫星。2A.b
6、esides BhoweverCthough Dtherefore解析：选B上文说月亮是地球唯一的卫星，而下文说后来有了很多别的卫星，所以是转折关系。副词though表示“可是，然而”，放在句中时，其前后没有逗号。however“然而”放在句中时，前后可以有逗号，故选B项。3A.assumed BdiscoveredCmade Dforesaw解析：选C从下文中的“These manmade satellites .”可知，这些卫星是人造的，也就是“made by man”。4A.through BroundCbehind Dafter解析：选B联系关键词still“仍然”，再联系上文中的“g
7、oing round the earth”可知，这些人造卫星仍然会绕着地球转。5A.fall BriseCburst Dpause解析：选A从下文内容可知，此处是讲述人造卫星不会落下来的原因。6A.decide BwishCplan Dtend解析：选D当卫星加速时，卫星的运动趋势就是冲入太空。7A.pull BreachCbring Dlaunch解析：选A它们会冲出地球，也就是脱离地球引力。pull out意为“冲出，离开”。8A.protects BpreventsCkeeps Ddiscourages解析：选B地球引力的作用是阻止它们冲出地球。9A.in and out Bon and
8、 onCto and from Dup and down解析：选B从上文内容可知，如果卫星在一定高度运行，就能持续运转。on and on意为“一直，持续”，符合文意。in and out意为“出出进进”； to and from意为“来来回回，往返”；up and down意为“上上下下”，均不符合文意。10A.because BhowCwhere Dwhen解析：选A本句讲述的是卫星正常运转的原因，故选A。11A.hand BpassCslow Dbring解析：选C卫星正常运转的原因就是在大气层之上，没有东西会降低卫星的运行速度，下一句中的“it will be slowed down”
9、是很好的提示。12A.higher BlongerCfarther Dlower解析：选D从上文我们知道卫星正常运转，不会落下来就是因为它的运行高度，所以，如果他们运行高度下降，卫星就不能正常运转。13A.search for Bfall toCgo after Dknock at解析：选B从本段我们可以看出，如果运行高度下降的话，卫星就会掉下来。14A.witnessed BofferedClaunched Ddrove解析：选C我们知道飞船是人们发射上去的。15A.nearest BsmallestCbiggest Dfarthest解析：选A根据常识，我们知道人们发射的飞船是到了最近的星
10、球上。16A.board BaverageCearth Dend解析：选A通过把照相机安装在飞船上，可以拍照。on board意为“在(船、火车、飞机)上”，符合文意。on average意为“平均”；on earth意为“到底，究竟”；on end意为“竖着，连续地”，均不符合文意。17A.avenge BfilmCcatch Dtake解析：选D固定搭配take photographs of .意为“给拍照”。18A.holy BhiddenCdifferent Dstable解析：选B根据常识我们知道月亮有一面是永远背对我们的，所以不被我们看到。hidden是动词hide“隐藏”的过去式
11、。19A.rocks BspeechesCsounds Dphotos解析：选D上文提到了在飞船上安装照相机，所以传回来的是照片。20A.moon BearthCspaceship Dspace解析：选A根据上文内容可知，这些照片表明月球的另一面与面对我们的一面几乎是完全相同的。.阅读理解You dont know what youve got until its gone. When I bake cookies, I immediately miss them the moment I have eaten the last one. Last summer when I left a s
12、ummer camp, I didnt realize how great it really was until I got home. What happens, however, when that happens to one of your senses?A few months ago, I woke up deaf in one ear. I did not pay much attention to it at first. It felt that I had water in my ear. However, I began to hear less and less ou
13、t of that ear. I even had to ask people to talk into my other ear so I could hear them. I didnt realize how serious it was until later in the day. That evening, when I was sitting on my bed doing chemistry homework, I fell off my bed! When trying to get up, I was incredibly dizzy (头晕的)I went to see
14、a doctor who told me that hearing loss was common. However, it was usually bilateral,_or occurs in both ears. He said that my hearing should come back within a week.After about a week the dizziness eventually went away, but the hearing loss did not. The medicine helped and I gained some of my hearin
15、g back. After many hearing tests, it was determined that I had permanent hearing loss in that ear.School became harder for me because I couldnt hear my teachers. I was very depressed.Finally, I bought a hearing aid. With the hearing aid, my hearing is almost back to normal! It makes school and group conversations easier.My friends, teachers, and even complete strangers always ask me questions about
