1、课时作业(二十)Unit 5Section Grammar现在完成进行时.单句语法填空1Well, we _ (find) the bones of tigers and bears in the caves, and we think these were their most dangerous enemies.2He _ (write) a novel, which will be finished next month.3The little boy is dirty all over because he _ (play) in the mud all the morning.4He
2、 _ (lie) in bed for two weeks because of his broken leg.5You know, I _ (look) for a job for three months，and this is my first formal interview.阅读理解Scientists recently discovered that pictures on cave walls at Creswell Crags are the oldest known in Great Britain. But they didnt find out in the usual
3、way.Archaeologists often date cave art with a process called radiocarbon dating. The technique can measure the age of carbon found in charcoal (木炭) drawings or painted pictures. Carbon is an element found in many things, including charcoal and even people. But in this case, there was no paint or cha
4、rcoal to test. People carved the pictures of animals and figures into the rock using stone tools. The scientists had an “aha！” moment when they noticed small rocks stuck to the top of the drawings. The small rocks must have formed after the drawings were made.“It is rare to be able to scientifically
5、 date rock art.” said Alistair Pike, an archaeological scientist at Britains University of Bristol. “We were very fortunate that some of them were covered by stalagmites (石笋)”When a test proved that the stalagmites formed 12,800 years ago, the scientists knew the art underneath them had to be at lea
6、st that old. And some of the animals shown, like the European bison, are now extinctanother tipoff that the art is quite old.The artists came to Creswell Crags. This place is one of the farthest points north reached by our ancient ancestors during the Ice Age. At that time, much of the North Sea was
7、 dry, so people could move about more easily.Some tools and bones found there are 13,000 to 15,000 years old. They show that the travellers hunted horses, reindeer, and arctic hare. Their artwork is similar to art in France and Germany. It tells scientists that the Creswell Crags artists must have h
8、ad a close connection to the people several thousand kilometres awayanother important clue to understanding how humans spread out across the world.1Why do scientists say the art is quite old?AThe animals carved in the stone are strange.BThe art was carved into stone with stone tools.CThe cave is one
9、 of the farthest points in the world.DSome pictures were covered by stalagmites more than 10,000 years old.2What can we learn from the passage?ACarbon is a rare element.BTo date rock art in scientific methods is not very difficult.CSome animals shown on the cave walls at Creswell Crags have died out
10、.DDuring the Ice Age, it was more difficult for people to travel around by land than by sea.3Which of the following would be the best title for the passage?ACave art in Britain.BCave art found in an unusual way.CCave art proved to be Britains oldest.DCave art about animals is most beautiful.课时作业(二十)
11、.单句语法填空1have been finding2.has been writing3.has been playing4has been lying5.have been looking.阅读理解【语篇解读】科学家们最近发现了英国最古老的壁画，并试图推测它们的年代、主题等。1答案与解析：D推理判断题。根据第三、四段可知，一些画表面覆盖着的石笋已有12 800年的历史，据此科学家推测出此画非常古老。2答案与解析：C细节理解题。由第四段第二句可知，岩石壁画里的某些动物，如欧洲野牛已经灭绝，所以C项正确。3答案与解析：C标题归纳题。本文主要讲述了已知的英国最古老的壁画，内容包括年代的推测，壁画的主题、特点及其意义等，所以选C项。
