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1、Unit 5李仕才基础回顾.单句语法填空 1It is assumed that stress is mainly caused by too much work.2If you dont like the school lunch, you have the alternative of bringing your own.3She has kept up physical training for several years without interruption (interrupt)4The more we are aware of the significance (signifi
2、cant) of this famous saying, the more benefits we will get in our daily study and job.5If you study in a systematic (system) way, you wont leave anything out.6The plants need the right amount of sunlight and rain to grow and ripen (ripe)7The mechanic who wishes to do his work well, must first sharpe
3、n (sharp) his tools.8The escaped prisoner got arrested (arrest) immediately he turned up at the railway station and was sent to prison again.9Scientists have identified (identify) more than forty chemicals in tobacco smoke that cause cancer in humans and animals.10In contrast to our ignorance of sav
4、ing food, many people especially those in povertystricken areas are suffering from starvation (starve).单句改错(每句一错 1I had no alternative but report him to the headteacher.report前加to2Assumed that the weather is favorable, farmers will have a good harvest.AssumedAssuming/Assume3He could have finished it
5、 on schedule, but anyhow he fell behind.anyhowsomehow4Im very sorry to interrupt with you, but I have something very important to tell you.去掉with5The significance attaching to a national day is very different from country to country.attachingattached.佳句写作 1他们急匆匆地到达公司，结果了解到他们被开除了。(only to作结果状语)答案：The
6、y hurried to the company，only to learn that they were fired.2看看我们现在所处的困境。要是我们接受了他的建议就好了。(if only)答案：Look at the trouble we are in now.If only we had taken his advice.3看，我的妈妈正在切碎包饺子的肉。(cut up)答案：Look，my mother is cutting up the meat for making dumplings.4假设他在七点回来的话，我们就开会。(assume)答案：Assume/Assuming th
7、at he comes back at seven，we will have a meeting.5尽管下大雨，医护人员还是迅速地赶到事故现场。(in spite of)答案：In spite of the heavy rain，the doctors and nurses rushed to the scene of the accident.技能提升.阅读理解 The ancient Mayan civilization collapsed due to a centurylong drought, new research suggests.Minerals taken from Bel
8、izes famous underwater cave，known as the Blue Hole，as well as lagoons (环礁湖) nearby, show that an extreme drought occurred between A. D. 800 and A. D. 1,000, right when the Mayan civilization ended. After the rains returned, the Mayans moved northbut they disappeared again a few centuries later, and
9、that disappearance occurred at the same time as another dry period, the sediments (沉积物)reveal.Although the findings arent the first to tie a drought to the end of the Mayan culture, the new results strengthen the case that dry periods were indeed the cause. Thats because the data come from several s
10、pots in a region central to the Mayan heartland, said study coauthor Andre Droxler, an Earth scientist at Rice University.From A. D. 300 to A.D700, the Mayan civilization flourished in the Yucatan peninsula. These ancient Mesoamericans built great pyramids, mastered astronomy, and developed both a w
11、riting system and a calendar system, which is famous for predicting that the world would end in 2012.But in the centuries after A. D. 700, the civilizations building activities slowed and the culture fell into war and unrest.The evidence for a drought has been growing in recent years. A 2012 study i
12、n the journal Science analyzed a 2,000yearold stalagmite(石笋) from a cave in southern Belize and found that sharp decreases in rainfall coincided with periods of decline in the culture. But the data came from just one cave, which meant it was difficult to make predictions for the area as a whole，Drox
13、ler said.To look for signs of drought, the team drilled the sediments in the Blue Hole of Lighthouse Lagoon, as well as one in the Rhomboid reef. The lagoons were surrounded on all sides by thick walls of coral reef. During storms or wetter periods, excess water runs off from rivers and streams，over
14、tops the retaining walls, and is deposited in a thin layer at the top of the lagoon. From there, all the sediments from these streams settle to the bottom of the lagoon, piling on top of each other and leaving a record of the historical climate.The team found that during the period between A. D. 800
15、 and A. D. 1,000, when the Mayan civilization collapsed, there were just one or two tropical cyclones (气旋) every two decades, as opposed to the usual five or six. After that, the Maya moved north, building at sites such as Chichen Itza, in what is now Mexico.语篇解读玛雅文化如何消失是一个神秘话题。新研究发现：古玛雅文化的消失可能与长达一个世纪的干旱有关。1What happened after an extreme drought between AD. 800 and A. D. 1,000?AThe Mayans were suffering a heavy flood.BThe Mayans suddenly disappeared from the earth.CThe Mayans were often attacked by tropical cyclones.DThe Mayans moved to places in what is now called Mexico.解析：D细节理解题。
