高一期末英语试题：2012北京朝阳高一英语期末试卷(3)
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50. Why did the boy hide in a bedroom cupboard? A. He thought it was a good place to sleep B. He wanted to start a big rescue operation C. He didn’t think he could be easily found there D. He is Australia’s unofficial bide-and-seek champion. 51. What did the boy’s mother do when she couldn’t find her son? A. She checked the water tank[来源:学&科&网] B. She called the police and her husband C. She turned to her neighbor for help D. She searched the town from top to bottom 52. What can we learn from the passage? A. The boy felt very cold when he was found B. The boy knew clearly what was going on C. The mother usually hugged her boy very hard D. The mother was very grateful to find her boy 53. How did the boy feel after he found out what had happened? A. Pitiful B. Funny C. Frightened D. Sorry C Everything on Earth that scientists can see, measure or study is made of atoms and atoms are named by what types of elements(元素)they are. You probably know the name of many elements, such as oxygen, gold or hydrogen. In any case，elements are everywhere：You，your shoes，your desk，cars，water and air are all made of elements. Now, there’s a new kid on the block： copernicum. This element was officially named on February 19，but the element itself is n’t new. German scientists made and observed it in 1996.But In the l4 years since then, other scientists have been working to study and validate(证实)the original findings. Validation is an important part of the scientific process because it shows that a scientific discovery was not a mistake. All that hard work finally paid off when the element finally received its name，copernicum，from the International Union of Pure and Applied Chemistry Copernicum is named in honor of Nicolaus Copernicus, a 16th century Polish scholar who proposed that Earth moves around the sun and that Earth turns on its own axis. Scientists organize all the elements on a chart called the Periodic Table, Each element gets a symbol and its own number, and copernicum gets the symbol Cn and the number 112. This number means that inside every atom of copernicum are ll2 protons(质子).The lightest element hydrogen has only one proton inside each atom. Its ll2 protons make copernicum the heaviest known element with a name. It was first observed by Sigurd Hofmann, a scientist in Germany. In l996，Hofmann mad his team had to figure out a way to get all the protons together and stick.They used a machine that can speed up atoms up to 10 percent the speed of light. After a week of working on these high-speed co llisions(碰撞)， Hofmann’s team found copernicum even though it quickly disappeared. Now, 14 years after Hofmann’s experiment, other scientists are able to make copernicum and validate Hofmann’s original work. Scientists are excited about copernicum. If such a super heavy atom can be created, then even heavier elements might be waiting in the future “One of the exciting things is，how far can we keep going?” says nuclear chemist Paul Karol. 54. What do we know about copernicum? A. It is the heaviest element so far B. It was officially named in l996 C. It is a newly-discovered element D. It is the most difficult element to validate 55. Why is copernicum named after Nicolaus Copernicus? A. Because he proved the existence of the element B. Because he put forward the sun-centered theory C. Because he observed the element in the l6th century D. Because he designed the Periodic Table for all the elements 56. By asking “how far can we keep going?” Karol means . A. how many elements p eople can find in the future B . how soon people can find another Dew heavy element C. how long people can walk carrying the heavy element D. how long people can continue to research into copernicum 57. What is the best title for the passage? A. A New Element Has Been Discovered B. The Periodic Table Is Changed Again C. The Heaviest Named Element Is Official D. Superheary Copernicum Needs Its Place (责任编辑：admin) |
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