文章大意：本文是一篇说明文，主要介绍了埃及修建尼罗河上的阿斯旺大坝时面临的对古寺庙和文化古迹造成损害，针对这个问题，埃及人民在联合国和世界教科文组织以及多方人员帮助下，共同努力终于成功的修建大坝的同时又保护了这些历史文化遗产。
7 . 根据前后文语境，选择适合的词进行填空,答案必须和课文原文一样，否则不给分。
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Economic development is necessary if we want to improve society. There comes a time when the old must give way to the new, and it is not possible 1 everything from our past as we move towards the future. Finding and keeping the right 2 between progress and the protection of cultural sites can be a big challenge.
Big challenges, however, can sometimes lead to great 3 . In the 1950s, the Egyptian government wanted to build a new dam across the Nile in order to control floods, produce electricity, and supply water to more farmers in the area. But the 4 led to protests. Water from the dam would 5 damage a number of temples and destroy cultural relics that were an important part of Egypt’s cultural heritage. After listening to the scientists who had studied the problem, and citizens who lived near the dam, the government 6 to the United Nations for help in 1959.
A committee 7 to limit damage to the Egyptian buildings and prevent the loss of cultural relics. The group asked for 8 from different departments and raised funds within the international community. Experts investigated the 9 , conducted several tests, and then made a proposal for how the buildings could be saved. Finally, a 10 was signed, and the work began in 1960.
