单项选择题

A UFO is a general term used for any "unidentified flying object" in the sky which cannot be (1) by an observer. Most UFOs remain (2) as so even after they have been investigated. The UFO phenomenon dates back (3) the beginning of recorded history, but UFO sightings have (4) increased since the mid 1940s.
From UFO videos to UFO pictures, stories and other real life (5) , thousands of people from all (6) of life claim to have seen these mysterious aerial phantoms. Many UFO sightings turn out to be nothing at all, mere airplanes, meteors or comets; (7) many sightings have gone unsolved for decades or even centuries.
The term "flying saucer" came into (8) use after American Kenneth Arnold claimed a UFO sighting on June 24, 1947 near Mount Rainier, Washington. Arnold claimed to have seen as many as nine brightly lit objects soaring (9) the sky (10) he estimated as up to 1,200 miles per hour. Arnold also reported that the objects appeared to have a disc or "saucer" (11) . (12) final conclusion has ever been reached in the case.
One of the most famous LIFO incidents to date also occurred in 1947 in Roswell, New Mexico. (13) unidentified debris was recovered from the (14) of a Roswell ranch, the Roswell Army Airfield (15) a statement saying that a "flying disk" had been discovered. The airfield (16) the statement just hours later, claiming it was just a weather balloon. This sparked (17) and nation-wide rumors of an alleged government (18) of an alien LIFO that had crashed in the New Mexico desert. No (19) proof has been produced to this day to (20) that theory.

（15）（）

A.got
B.issued
C.reached
D.fixed

<上一题 目录 下一题>
热门 试题

单项选择题
A. anyone else B. anyone else’s C. someone else D. someone else’s
A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippocampus, the region of the brain which is responsible for forming memories, does not mature (5) about the age of two. But the most popular theory (6) that, since adults do not think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) —one event follows (9) —as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fits the (11) . It’s like trying to find a Chinese word in an English dictionary.
Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply (13) any early childhood memories to recall. According to Dr. Simms, children need to learn to use (14) spoken description of their personal experiences in order to turn their own short-term, quickly (15) impressions of them into long-term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) —Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Ocean park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.
单项选择题
（14）（）

A.occupancy
B.possession
C.ownership
D.property
相关试题