大学英语六级考试模拟试卷(七).doc

大学英语六级考试模拟试卷(七)
Part I Writing (30 minutes)
注意:此部分试题在答题卡1上。
Part Ⅱ prehension (Skimming and Scanning) (15 minutes)
Directions: In this part you will have 15 minutes to go over the passage quickly and answer the questions on
Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A), B), C) and D).
For questions 8-10, complete the sentences with the information given in the passage.
Space Wars
In order bat a potential nuclear attack, the United States has been developing a space-based missile defense system for the past two decades. This defense system began under former. . President Ronald Reagan. His Strategic Defense Initiative (SDI) called for the development of laser weaponry that would orbit the earth to shoot down ballistic missiles (弹道导弹). There is now even talk of the United States developing a fifth military branch, perhaps called Space Force, that would pick up where the Air Force leaves off.
Satellite technology
In 1991, the United States and its allies used sophisticated satellite technology to pinpoint Iraqi targets during the Persian Gulf War. Intelligence-gathering satellites gave the American forces an unprecedented view of the battleground, showing every move that the Iraqi armies were making during the war. With the vast expanse of the desert landscape providing visibility, satellite imagery (图像) became the main source of information on the Iraqi army during the war.
Satellites also were a valuable tool in distributing troops during the Persian Gulf War. A constellation of satellites orbiting Earth, known as the Global Positioning System (GPS), was used by soldiers on the ground to determine their positions. These 24 satellites gave the longitude, latitude and altitude of the . soldiers carrying handheld GPS receivers on the battlefield. The open desert was an ideal location for using the GPS satellites, because there were very few natural objects around to interfere with the satellites’ signals. bi