Between 1852, when【C1】______was first established that Mount Everest was the highest mountain on earth, and 1953, when Edmund Hi

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问题     Between 1852, when【C1】______was first established that Mount Everest was the highest mountain on earth, and 1953, when Edmund Hillary, and Tenzing Norgay finally reached the peak’s summit, it was every mountaineer’s dream to become the first person standing on the world’s【C2】______point. And George Mallory was one of the most tenacious early contenders.
    Mallory was introduced【C3】______rock climbing while studying at Winchester College. 【C4】______completed his studies, he settled into a career【C5】______a teacher at Charterhouse School, and continued to pursue his passion【C6】______climbing in his spare time.
    Mallory’s【C7】______trip to Everest was a reconnaissance mission in 1921【C8】______ aimed to produce the first accurate maps of the region. Two【C9】______visits to the mountain followed. Then, on 8 June 1924, 【C10】______his third attempt to reach the summit, Mallory and his partner, Andrew Irvine, disappeared.
    Several expeditions subsequently attempted to find the pair, and Mallory’s【C11】______was finally discovered in May, 1999, at 8, 169 metres, 600 metres【C12】______the summit, 【C13】______with various items of equipment, including handwritten letters to his wife, a pocket knife, an oxygen bottle and his goggles, 【C14】______were later donated to the Royal Geographical Society【C15】______Mallory’s family.
    There is still considerable debate as to【C16】______Mallory reached Everest’s summit. The【C17】______that his goggles were found in his pocket has led some to suggest that he was on his way down the mountain【C18】______ he fell. Had he been ascending in daylight, he would have been wearing the goggles to【C19】______snow-blindness, and given what is known of the pair’s climbing schedule, if it were【C20】______when they fell, they must have been on their way back down.
【C1】

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答案it

解析 本句意为“人们开始认识到珠穆朗玛峰是地球上最高的山峰。”此空所填单词应是作为形式主语的“it”,指代“that Mount Everest was the highest mountain on earth”。
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