根据短文内容选择可以填入空白处的最佳答案。

　　Mr．Thomas and his wife had taken their nine-year-old grand-daughter to Paris for a short holiday．One morning they set off for a 　　1　　 on one of the Metro lines where the trains run on rubber wheels．In changing from one line to 　　2　　, the child was 　　3　　 behind on the platform in the rush to get on the train．　　4　　 that Mr．and Mrs．Thomas could do was 　　5　　 out at the next station and ask a station official to telephone back to 　　6　　 the child taken care of．They caught the very 　　7　　 train back and felt pleased to see the little girl 　　8　　 patiently on a bench on the opposite platform．

　　　　9　　 they had crossed 　　10　　, the child had vanished．An official told them that he had 　　11　　 her(in French, of course)and she had immediately run away．　　12　　 followed an hour of searching every passage in the station until 　　13　　 Mr．Thomas went to the police, who agreed to 　　14　　 the search．One police officer had the 　　15　　 idea of telephoning the hotel where they were staying．What a relief to hear that the child had been saved by a kind young lady and brought back to the hotel! The child, who spoke no French, had given the name of the Metro station near the hotel．

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阅读下面短文，掌握其大意，然后从各题所给的A、B、C和D项中，选出最佳选项。

　　Thousands of years ago, human didn't live in towns．Sometimes they would live in caves or build camps(宿营地)in the forest．

　　Only about thirty people 　　1　　 in each camp．The men would go hunting while the women and children 　　2　　 food from the trees around the camp．All the food was 　　3　　 between everyone in the group．Every few weeks they moved to another place to find more food．It was a simple life, but people had to be 　　4　　 They had to make everything that they needed, and they had to know a lot about plants and animals．

　　Nowadays most people live in towns and cities, and they work in offices and factories．Life is 　　5　　 than in the old days．There are fewer 　　6　　, but there is less excitement．Some people go 　　7　　 excitement－sailing round the world, climbing mountains, or exploring caves．Most people look forward to the 　　8　　, a time when they can enjoy a change from their normal life．For some this means going camping．But camping today is 　　9　　 from camping in the past．Gas cookers, ready-made food and air-beds mean people can camp much more 　　10　　 than they did in the old times．

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