2019-2020学年高中英语 课后限时作业15 外研版选修8

课后限时作业(十五)(见课时作业p29)语言知识练.单句语法填空1the united states is often viewed _as_ a melting pot of different nationalities.2if you dont know which university to go to, consult the teacher _for_ advice.3_accused_(accuse) of killing the neighbour, he was taken to the court.4joe is acknowledged _as_ the best basketball player of the year in our school.5john blew his top when his team was _defeated_(defeat) in the match.6the new secretary will relieve us _of_ some of the paperwork.7a series of accidents _has_been_reported_(report) lately.8it was a great _relief_(relieve) when i heard i had passed the exam.9we should read more books to _broaden_(broad) our horizons.10the moment they came into the classroom, they set out _to_read_(read).句型训练1他正在看书， 这时听到外面有很大的噪音。he _was_reading_a_book_when_ he heard a big noise outside.2祝你们俩之间的友谊长存！_may_the_friendship_between_you_two_ last forever!3如果你不想让我打你， 就给我看看你买了什么东西。if you dont want me to beat you, show me _what_you_bought_.4我几乎没有想过会成为医生。_little_did_i_think_ that i would become a doctor.5被指控在考试中作弊， 这个女孩被送回家了。_accused_of_cheating_in_the_exam_， the girl was sent to her home.高考题型练.阅读理解athe sky is a large place, and though it has been carefully examined for centuries, new features still turn up. last march it was the rule of uranus(天王星), and last week astronomers announced what may turn out to be a new planet, though a very small one, in the solar system.the object was first sighted last month by charles kowal, an astronomer at the hale observatories in pasadena, calif. mr kowal observed a faint trail of light on photographic plates, indicating that something was moving in relation to the background of stars. other observers have confirmed the discovery.the “miniplanet”， identified for the time being as “objectkowal”， appears to be about 1.5 billion miles away, between the orbit of saturn and uranus, and its diameter(直径) has been estimated at between 100 and 400 miles. its orbit has not been determined yet, but if the orbit proves to be roughly circular, like that of the major planets, the new object would probably take 66 to 70 years to make a circuit of the sun.some astronomers have speculated that mr kowals discovery may be the first indication of an asteroid(小行星)belt beyond saturn.本文介绍了目前在太阳系新发现的可能是一颗小行星的天体。1what may have been found in the solar system according to the first paragraph?aa small new planet. ba new solar system.ca large new object. da large new planet.解析 a细节理解题。根据第一段第二句可知， 在太阳系中新发现了可能是一颗小行星的天体， 故选a项。2what can we learn from the second paragraph?awhat the object is like. bhow the object was found.cwhere the astronomers live.dwhy the object was moving.解析 b细节理解题。根据第二段内容可知， 天文学家charles kowal在照相底片上观察到了一条淡淡的光亮路径， 指出有东西在相关的恒星后面移动， 其他观察者也证实了这一发现， 所以第二段主要讲述了该行星是如何被发现的， 故选b项。3what magazine might this passage be taken from?aastronomy. bindustry. cspaceflight. dagriculture.解析 a文章出处题。根据全文可知， 本文主要介绍了目前在太阳系新发现的一颗疑似小行星的天体， 这类文章最可能出自与天文学相关的杂志上， 故选a项。ba new study suggests that dark markings on the planet mars represent sandnot water. the research in 2015 suggested that lines on some martian hills were evidence of water. yet american scientists now say these lines appear more like dry, flows of sand. if water is present, it is likely to be a small amount. water in liquid form would be necessary for microbial(微生物的) life.nasa, the american space agency, said more research is needed. michael meyer is the lead scientist for nasas mars exploration programme. he noted that the latest study does not reject the presence of water. but he admitted, “it just may not be as exciting as the idea of rivers going down the sides of cliffs(悬崖)”the new findings come from a team led by colin dundas of the united states geological survey. his team measured 151 of these lines in 10 areas. most of the lines end with slopes between 28 degrees and 35 degrees. these measurements are similar to active sand dunes(沙丘) on both mars and earth. a small covering of dust that moves and sometimes becomes lighter might help explain the markings. they usually appear in the martian summertime, and then disappear until the next year. if these lines are dry, this suggests that recent mars has not had large volumes of liquid water. dundas and his research team say that many questions remain.“i still think that mars has a great potential for having had life early on in its history, ” meyer said. “as long as thats true, we also have a reasonable possibility of life still being on mars. it just happens to be cryptic or well hidden.”nasa currently has no robotic vehicle either on mars or in developmentwith the ability to climb steep slopes. the lack of such equipment has engineers coming up with ideas like martian helicopters or planes without pilots.本文主要讲述了美国科学家的一项新的研究发现：火星上黑色的标记是沙子而不是水。4what do american scientists find on mars now according to their study?aa lot of little life. ban amount of water.csome martian hills. ddark markings are sand.解析 d细节理解题。根据第一段第一句可知， 科学家发现火星上的黑色标记是沙子不是水， 故选d项。5when do the markings come out?ain martian spring. bin martian summer.cin martian autumn. din martian winter.解析 b细节理解题。根据第三段倒数第三句可知， 这样的标记会出现在火星的夏季， 故选b项。6whats meyers opinion about having life on mars?adoubtful. btrustful.cindifferent. dobjective.解析 b观点态度题。根据第四段可推知， meyer还是相信火星上有生命， 故选b项。7what does the underlined word “cryptic” in paragraph 4 mean?aundiscovered. bstrange.cmagical. dicy.解析 a词义猜测题。根据句中的or well hidden可知， cryptic的意思是“隐藏的；没被发现的”， 故选a项。.语法填空mother nature is so powerful that there are times when the very course of historical 1._(event) has been influenced due to her forces. in 1588, king phillip of spain sent his spanish armada(无敌舰队) to attack england. things were going fine until the armada made it to calais, where each boat dropped its anchor and waited 2._(join) forces with the spanish army. then, the english attacked, sending eight burning ships into the 3._(crowd) harbor. whats worse, mother nature attacked. high winds and waves from an atlantic storm, plus the fire ships,4._(leave) the spanish armada with no choice but to return to spain.when napoleon decided to invade(入侵) russia in 1812, it wasnt 5._ huge surprise that the invasion was a complete 6._(fail). napoleons over 600,000 men and more than 200,000 horses were no match for russias 20 to 4 degrees centigrade winters, 7._ led napoleon to give up and return home. when american bomber bockscar took off from tinian on august 9, 1945, its initial target was 8._(actual) not nagasakiit was kokura. but when the bomber approached the city, the target was overcurtained by heavy clouds. pilot sweeney circled the area three times 9._ deciding to move onto the missions secondary target, nagasaki. at 10：58 am. local time, bo