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1、双基限时练 Unit 4Part .单句语法填空1. In 2015, a _ (violence) explosion happened in Tianjin.答案violent2. Forming a good habit of studying is fundamental _ ones achievements in the years to come.答案to3. Now we still dont know whether life _ (exist) on Mars.答案exists4We usually take turns _ (do) cleaning, and today
2、 it is my turn _ (do) it.答案to do; to do5There is a _ (puzzle) look on her face. Actually, she felt _ (puzzle) about all of this.答案puzzled; puzzled6_ Alice will be able to get help for the rescue is not certain yet.答案Whether7She made _ her duty to look after the old woman in her spare time.答案it8Cindy
3、 didnt leave the office last night _ she finished her job.答案until9Although the traffic was heavy, I managed to be _ time for the important lecture.答案in10It is _ (unlike) that he will come to help soon because he has just gone out.答案unlikely.阅读理解AEdmund Halley was an English scientist who lived over
4、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 who dealt with such problem.However, Halley had a friend named Isaac Newt
5、on, 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 (椭圆形)Now Halley set to work. He figured out (计算出) the orbits of some of the com
6、ets 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 Halley. Three different comets followed the same orbit. The
7、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 predi
8、ction (预言) of what 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 the comet appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that comet had
9、 been called Halleys comet，in his honour.1Edmund Halley figured out the orbit of _.A. some different comets appearing several timesB. the same comet appearing at different timesC. three different comets appearing three timesD. several comets appearing at the same time答案与解析B根据第四段和最后一段可得出答案。2Halley ma
10、de his discovery _.A. by doing experimentsB. by means of his own careful observationC. by using the work of other scientistsD. by chance答案与解析C根据第三段内容可知，哈雷是在计算其他科学家的数据。3Halley made a surprising, but correct prediction in the year _.A. 1704B. 1705C. 1706D. 1707答案与解析B根据倒数第二段，1758531705。4This passage in
11、 general is about _.A. Halley and other scientistsB. the orbit of a cometC. Newton and HalleyD. Halley and his discovery答案与解析D全篇在讲述哈雷和哈雷彗星。BWelcome to the Astronomy (天文学) Club of Akron (ACA) webpage. The purpose of the ACA is to further an interest in and to promote the study of the subject of astro
12、nomy through the use of lectures, discussion groups, publications，programs and other activities.The ACA will educate the general public through monthly programs. These programs, lectures and events cover the planets, solar/lunar observing, comets (彗星) showers，deep sky objects and so on.The ACA activ
13、ities provide opportunities for its general club members to get together and take part in a variety of general astronomy related matters.Membership is open to anyone with an interest in astronomy. No equipment is necessary and no knowledge is needed. There is no age limit. Club members meet on the 4
14、th Friday of every month at 8 a. m. at the Kiwanis Hall in Portage Lakes. During the meeting, a onehour talk will be on astronomy, space exploration or weather. The date of the meeting will change if the 4th Friday is part of a holiday weekend. Check the calendar, view the most recent newsletter (简报
15、), send emails or call the number listed on our home page if in doubt. The ACA publishes a monthly newsletter, The Night Sky, which contains information on the coming meetings, observing sessions and articles by members.Club dues are $30 a year for adults (18 and over), $15 for juniors (12 to 17). The family only needs $40 a year. Welcome to our club and you can call 18663399783 to find more information about us.5The ACA is really a(n) _.A. webpageB. clubC. officeD. magazine答案与解析B根据文章第一段的第一句“Welcome
