1、课时训练.单词拼写1.Some computers can perform a b (1000 million) computation a second. 答案:billion2.As we all know,t comes from practice,and in turn it must serve practice. 答案:theory3.We know that matter is made up of a . 答案:atoms4.From space the earth looks like a huge water-covered g . 答案:globe5.The talk b
2、etween the two countries went on in a friendly a . 答案:atmosphere6.Eating junk food is (有害的) to the young. 答案:harmful7.With so many problems arising,the ( 制度)should be improved. 答案:system8.The boy likes studying the universe and he wants to choose (天文学)as his major. 答案:astronomy9.Police say armed rob
3、bery is the fastest-rising ( 暴力的 )crime. 答案:violent10.As is well known,fresh air is ( 基本的)to good health. 答案:fundamental.选词填空in time be harmful to give birth to in ones turn prevent.from. lay eggs be puzzled about come into existence1.Do you know that crocodiles reproduce by ? 答案:laying eggs2.During
4、 the car accident,he was to escape from the car without being hurt. 答案:in time3.No matter what will happen,nothing and nobody can the plan being carried out. 答案:prevent;from4.This chemical the environment. 答案:is harmful to5.She lost heart since she failed in the exam.She her future.She had no idea w
5、hat to do next. 答案:was puzzled about6.Scientists have many theories about how the universe first . 答案:came into existence7.After the second competitor went off the stage,my son went onto the stage to perform . 答案:in his turn8.He told us happily that his wife would a baby the next week. 答案:give birth
6、 to.完成句子1.The other day the cat three kitties.(birth) 几天前这只猫生了三只小猫。答案:gave birth to2.If you fly to Shanghai,you will .(attend) 如果你乘飞机去上海,你就能够及时赶上出席会议。答案:be in time to attend the meeting3.Now it is the room.(turn) 现在轮到我们打扫房间。答案:our turn to clean4.The polluted water can .(harmful) 污染的水会对环境造成很大的危害。答案:b
7、e very harmful to the environment5.His father work in another city.(prevent) 他父亲阻止他去另一个城市工作。答案:prevented him from going to6.No one knows when such a custom first .(existence) 没有人知道这一风俗首先是什么时候开始存在的。答案:came into existence7.My parents .(as well as) 我的父母和我的哥哥都喜欢旅行。答案:as well as my brother enjoy travelli
8、ng8.Whether the couple will go abroad .(remain) 这对夫妇是否要到国外去仍拭目以待。答案:remains to be seen9. ,it will be snowy today.(according) 据广播报道,今天有雪。答案:According to the radio10.You by seven oclock at the latest tomorrow.(be to) 你们明天一定要在最迟不过 7 点钟到这里。答案:are to be here.精彩回顾下面一段文章是课文原文的浓缩,仔细阅读,根据课文内容将其补充完整,并背诵。The o
9、rigin of life on the earth is an interesting question.It was a widely accepted 1. that the universe began with a “Big Bang”,after which the earth was still just 2. .Between 4.5 and 3.8 billion years ago it settled into a solid 3. .The earth was very 4. and exploded loudly with fire and rock.They wer
10、e in time to produce carbon dioxide,nitrogen,water vapour and other gases,which were to make the earths 5. .Then as the earth cooled down,water appeared,which was 6. to the development of life.Later,plants appeared,providing 7. for the oceans and seas,in which some animals appeared.Then green plants
11、 began to grow on land,and land animals,forests,reptiles,and huge animals such as dinosaurs appeared.Dinosaurs 8. made the rise of mammals possible.After human beings 9. ,they put lots of carbon dioxide into the atmosphere,10. heat from escaping from the earth into space.Because of it,life on the ea
12、rth is in danger.Thus,measures must be taken to stop it. 答案:1.theory 2.a cloud of dust 3.globe 4.violent5.atmosphere 6.fundamental 7.oxygen 8.disappearance 9.came into being 10.preventing.阅读理解What science fiction(story) once told about other worlds far away is now a fact.Astronomers(experts at the s
13、cience of the universe)prove another solar(of the sun)system like ours with some planets in the constellation Andromeda(仙女座 ).Geoffrey Marcy is a professor of astronomy and physics at San Francisco State University and says,“What we have found now,for the first time ever,is indeed a fully-grown syst
14、em of planets around the star Upsilon Andromeda.It appears to have three planets,one close in,one at a middle distance,and one farther out.The star is slightly larger than our sun.The planets are huge,like our Jupiter(木星).”Marcys partner in this research,Debra Fischer,describes the solar system,“Her
15、e are the inner planet that goes around every 46 days,the middle planet that goes around every 242 days,and then the outer planet that goes around every three and a half to four years.”Astronomically,its not far away,44 light years.The sun of that solar system,Upsilon Andromeda,is so near and bright
16、 that it can be seen by using no equipment during summer and fall.For twelve years astronomers searched the skies in the belief that if our sun has planets around it,surely others do,too.Geoffrey Marcy says,“And then starting three and a half years ago,we began finding for the first time planets sin
17、gly,one planet here around one star.”“When I look up at the stars now at night,I can imagine easily that every one of them has planets around them,”says Debra Fischer.It was a tremble(shaking)in the star that led Marcy to the planets.“The star rocks around due to the gravity of the planet as a dog o
18、wner gets pulled around by a little dog.”Can they support life?We dont know,because present technology is not advanced enough to determine what the planets are made of.That,Marcy says,is astronomys next challenge.1.Whats the relation between Andromeda(A),Upsilon Andromeda system(U)and the mentioned
19、three planets(P)?解析:推理判断题。通读全文可知 Andromeda 是一个星座,像太阳系;UpsilonAndromeda 是一颗恒星,像太阳;threeplanets 是它的三个卫星,因此可推出 B 项正确。答案:B2.According to Debra Fischer,in the new solar system, . A.the farther a planet is from the star,the longer it takes to go around the starB.the larger a planet is,the shorter it takes
20、 to go around the starC.it takes all the planets around three and a half to four years to go around the starD.the planets move around the star at the same speed解析:推理判断题。根据天文常识及本文所述 ,任何行星的卫星的运转周期不可能是一致的,越是远离行星,一般运转周期越长。答案:A3.What led to Marcys discovery of the planets?A.That he found a dog owner was
21、pulled by his dog.B.The tremble of Upsilon Andromeda.C.That any planet has gravity.D.That he believes any star has its planets.解析:细节理解题。由倒数第二段可知。答案:B4.We can infer that the scientists are . A.to find out whether the planets can support lifeB.to find means to communicate with the living beings on the planetsC.to find means to travel to the planetsD.soon to be able to answer the question of whether there is life on these planets解析:推理判断题。其他几项提到的不是本文重点或没提及。答案:A
