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【正文】 ousands of such observations have since been reported worldwide. 17. From 1947 to 1969 the US Air Force investigated UFOsas a possible threat to national 1947 to 1969 the US Air Force investigated UFOsas a possible threat to national security. 18. The UK Ministry of Defence recorded 634 UFO sightings in 2020,the second highest annual total after 1978, when there were 750,according to UFO expert Dr David UK Ministry of Defence recorded 634 UFO sightings in 2020,the second highest annual total after 1978, when there were 750,according to UFO expert Dr David Clarke. 19. UFOs have been subject to investigations over the yearsthat vary widely in scope and scientific or independent academics in the United States, Canada, the United Kingdom,Japan, France, Belgium, Sweden, Brazil, Chile, Mexico, Spain, and the Soviet Unionare known to have investigated UFO reports at various have been subject to investigations over the yearsthat vary widely in scope and scientific or independent academics in the United States, Canada, the United Kingdom,Japan, France, Belgium, Sweden, Brazil, Chile, Mexico, Spain, and the Soviet Unionare known to have investigated UFO reports at various times. 20. In 1997 the US Central Intelligence Agency (CIA) admittedthat the US military had deceived the American publicin an effort to hide information about highaltitude spy 1997 the US Central Intelligence Agency (CIA) admittedthat the US military had deceived the American publicin an effort to hide information about highaltitude spy planes. 21. At least 90 percent of UFO sightings can be identified as conventional objects,although timeconsuming investigations are often necessary for such least 90 percent of UFO sightings can be identified as conventional objects,although timeconsuming investigations are often necessary for such identification. 22. The objects most often mistaken for UFOs are bright plas and stars,aircraft, birds, balloons, kites, aerial flares, peculiar clouds, meteors, and objects most often mistaken for UFOs are bright plas and stars,aircraft, birds, balloons, kites, aerial flares, peculiar clouds, meteors, and satellites. ti:Unit2 PartB Listening Tasks Text 1 A UFO in My Yard (Part One) Exercise 1 Listen to the recording and decide whether the following statements are true or false. Write T for true and F for false. It was one . one cold fall night in 1968. I was 21 then, and was ing home from a date. I had just dropped off my girlfriend and was heading back to Franksville, a rural town in Wisconsin. As I turned left to go east on Seven Mile Road, I saw extremely bright lights streaming out from the distance. My heart skipped a beat. What was producing these strange lights visible from a half mile away? I thought it was a house on fire. The lights seemed to emanate from the area where my house was located. My parents and two brothers were probably in bed by now. As I accelerated and turned onto the town street, frantic thoughts ran through my mind. Was the house burning down? Was my family trapped inside? As I raced toward my house, I noticed that the yards of my house and my neighbors39。 were illuminated as if it were day. Then I saw the source of the strange light. It wasn39。t a house fire, as I had feared. It was a possibility I would have never anticipated, one that was perhaps even more fearsome than the house fire I had imagined. Hovering motionless only 50 feet above the rooftops was a strange object. Round and silvery, it was approximately 300400 feet in diameter. In the wake of the hovering enigma, there was an eerie silence. I stuck my head out the driver39。s side window to get a closer look at what I guessed was some kind of aircraft. It looked made of aluminum, except for two cones that protruded from the top and bottom of the craft39。s center. Both cones seemed to be made of a glasslike material. The top cone was white, while the bottom cone glowed yellow. White lights circled the yellow cone on the underside of the craft. Each light was about 34 feet in diameter. It didn39。t look like any conventional aircraft I had ever seen. It looked like a flying saucer from a movie. Was this what an alien spaceship truly looked like? I pondered what to do. If I pulled into the driveway I would be putting myself directly beneath the craft. I considered turning the car around and speeding away. Exercise 2 Listen to the recording again and plete the following sentences with what you hear. It was one . one cold fall night in 1968. I was 21 then, and was ing home from a date. I had just dropped off my girlfriend and was heading back to Franksville, a rural town in Wisconsin. As I turned left to go east on Seven Mile Road, I saw extremely bright lights streaming out from the distance. My heart skipped a beat. What was producing these strange lights visible from a half mile away? I thought it was a house on fire. The lights seemed to emanate from the area where my house was located. My parents and two brothers were probably in bed by now. As I accelerated and turned onto the town street, frantic thoughts ran through my mind. Was the house burning down? Was my family trapped inside? As I raced toward my house, I noticed that the yards of my house and my neighbors39。 were illuminated as if it were day. Then I saw the source of the strange light. It wasn39。t a house fire, as I had feared. It was a possibility I would have never anticipated, one that was perhaps even more fearsome than the house fire I had imagined. Hovering motionless only 50 feet above the rooftops was a strange object. Round and silvery, it was approximately 300400 feet in diameter. In the wake of the hovering enigma, there was an eerie silence. I stuck my head out the driver39。s side window to get a closer look at w