Unidentified Flying Object is any object or light, reportedly sighted in the sky, that cannot be immediately explained by the observer. Sightings of unusual flying objects date back to ancient times, but UFOs became widely discussed only after the first widely publicized U.S. sighting in 1947. Many thousands of such observations have since been reported worldwide.
At least 90 percent of UFO sightings can be identified as conventional objects, although time-consuming investigations are often necessary for such identification. The objects most often mistaken for UFOs are bright planets and stars, aircraft, birds, balloons, kites, aerial flares, peculiar clouds , meteors, and satellites. The remaining sightings most likely can be attributed to other mistaken sightings or to inaccurate reporting, tricks, or delusions, although to disprove all claims made about UFOs is impossible.
From 1947 to 1969 the U.S. Air Force investigated UFOs as a possible threat to national security. A total of 12,618 reports were received, of which 701 reports, or 5.6 percent, were listed as unexplained. The air force concluded that no UFO reported, investigated, and evaluated by the Air Force has ever given any indication of threat to our national security. Since 1969 no agency of the U.S. government has had any active program of UFO investigation.
Some persons, however, believe that UFOs are extraterrestrial spacecraft, even though no scientifically valid evidence supports that belief. The possibility of extraterrestrial civilizations is not the stumbling block; most scientists grant that intelligent life may well exist elsewhere in the universe. A fully convincing UFO photograph has yet to be taken, however, and the scientific method requires that highly speculative explanations should not be adopted unless all of the more ordinary explanations can be ruled out.
Called Maglev for short, the system under discussion makes use of a high-speed train levitated above a guideway and propelled by magnetic fields. The project has been in the talking stage for several months.
Hans Ueberschaer, Germans ambassador visited the city together with Harmut Heine, representative of Thyssen Krupp. They had an initial discussion with the mayor there about the prospect of the project. The talks were believed to be constructive and paved the way for the future talks in Berlin, where a commitment was reached.
Sources familiar with the talks estimated that the project would cost US$723 million, which would cover everything from land use fees and rail construction to train cars. Completion date is 2005. A joint venture company is to be established for the project.
EXERCISE:
1. Who paved the way for further negotiations in Berlin?
A) The mayor
B) Both the German ambassador and the mayor.
C) The German ambassador.
D) The representative from the German company.
2. What was the signed commitment mainly about?
A) Finalizing the payment of US$723 million.
B) Establishing a joint venture company.
C) Conducting a feasibility study.
D) Outlining the German companys intention to export its technology.
3. What is the main feature of Maglev?
A) The Maglev train floats above the guideway and zip to its destination.
B) The Maglev train zips to its destination on the railway.
C) The Maglev train zips to its destination on a double guideway.
D) The Maglev train can carry more passengers than the electric train.
4. How large will be the success rate of the agreement signed by the two business parties according to the passage?
A) It is very likely that the city will have a German-built Maglev line.
B) It is very likely that Krupp will ban the export of its technology.
C) It is very likely that the city cannot afford the high payment.
D) It is very likely that the city will turn to buy US technology.
5. What type of writing do you think this passage belongs to?
A) An article on popular science.
B) An article taken from a transportation book.
C) A commercial contract.
D) A news report.
KEY: B C A A D
2015人教版六年级英语暑假作业练习试题(含答案)
2015年EEC小学新编五年级英语下册暑假作业题
2015年六年级英语暑假作业全部答案
2015学年五年级英语第二册暑假作业(含答案)
2015年五年级英语第二册暑假作业试题(冀教版)
2015年最新六年级英语毕业考试暑假作业试卷
2015学年六年级英语下册暑假作业试卷(附答案)
2015年PEP五年级下册英语暑假作业卷(含答案)
2015年六年级英语暑假作业训练题
2015年新标准英语第十册暑假作业试卷(有答案)
五年级英语下册暑假作业题
2015学年五年级英语第二册暑假作业试卷(带答案)
2015人教版六年级英语下学期暑假作业试题
人教版六年级英语暑假作业答案2015
人教版新版二年级英语第二册暑假作业题
15六年级英语下期暑假作业试题(新路径英语)
2015年PEP六年级英语暑假作业试题卷
小学一年级英语第二册暑假作业卷(儿童英语)
PEP六年级英语下册暑假作业检测试题2015
六年级下册英语暑假作业答案(生活指导)
六年级假期英语暑假作业检测试卷
2015外研版六年级英语暑假作业试题
15年pep小学六年级英语暑假作业练习试题
2015小学英语六年级下学期暑假作业试卷
PEP六年级英语下册暑假作业试题2015
科普版六年级暑假数学作业试卷
六年级英语暑假作业参考答案(完整版)
六年级英语下册暑假作业试卷(上海牛津英语附答案)
2015年雁江区六年级英语暑假作业题
2015年六年级英语暑假作业题及答案汇编
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |