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It's sometimes reported that strange objects have been seen high up in the sky. These unidentified(未确认的) flying objects - UFOs have made a lot of people interested. Some of the reports about them are difficult to believe.Some have been explained in scientific ways, others have never been explained.

　　It is not easy to decide whether a report is true or not. One report of UFOs came from a British plane on its way from New York to London in 1954. The British plane was flying over an island at 19,000 feet when the captain noticed that something was on their left and a little lower than their plane. It's about five miles away.

　　"It was not one object but several," the captain said. "We saw one large and six smaller objects. I sent a radio to report about them and I received the answer that the other planes were coming out to meet us. Before the planes arrived, the smaller objects entered the big objects. The big object then became smaller and moved away fast."

1.Some_____ have been explained in scientific ways.

2. In 1954, a British plane met a UFO when it was flying from_____ to_____.

3. The captain_____ and saw something on the left of their plane.

4. How many objects did the captain see?

5. The big object moved away because_____.

　　Time spent in a bookshop can be most enjoyable, whether you are a book-lover or only there to buy a book as a present. You may even have entered the shop just to find a shelter from a sudden rain. Whatever the reason, you can soon totally unaware of your surroundings. You soon become interested in some books or others, and usually it is only much later that you realize you have spent too much time there and have to rush off to keep some forgotten appointment.
　　This chance to escape the realities of everyday life is, I think, the main attraction of a bookshop. There are not many places where it is possible to do this. A music shop is very much like a bookshop. You can walk around such a place as much as you wish. If it is a good shop, no assistant will come up to you with the greeting “Can I help you?” You needn’t buy anything you don’t want. In a bookshop an assistant should remain in the background until you have finished reading. Then, and only then, are his services necessary.
　　Once, a medical student had to read a textbook which was far too expensive for him to buy. He couldn't borrow it from the library and the only copy he could find was in a certain bookshop. Every afternoon, therefore, he would go along to the shop and read a little of the book at a time. One day, however, he was disappointed to find the book missing from his usual place. He was about to leave, when he noticed the owner of the shop beckoning to him. Expecting to be told off, he went towards him. To his surprise, the owner pointed to the book which was tucked (folded beautifully) away in a corner. “I put it there in case anyone tries to buy it,” he said, and left the delighted student to continue his reading.
　　shelter: 遮蔽　　 unaware: 未意识到 attraction: 吸引　 beckon: 示意
　　45. According to the passage, the main attraction of a bookshop is that________.
　　A. people can learn something from books 　 　
　　B. it can be a shelter from a sudden rain
　　C. the surroundings are all about new knowledge 　　
　　D. it offers a chance to get free from the realities

　　46. The writer thinks that the assistant in a good bookshop should ________.
　　A. always greet customers pleasantly and warmly 　　
　　B. help the readers to find what they want to read
　　C. not talk while the customers are reading 　　
　　D. not stand beside the bookshelf all the time

　　47. The purpose of the writer in writing the last paragraph is to ________.
　　A. tell us a story that happened in a bookshop 　　
　　B. tell us what a good bookshop assistant is like
　　C. teach us how to read in a shop without buying books
　　D. advise us to hide books if we need them