Pyramid City is an even more ambitious project to solve Tokyo’s housing problem. A 1 ,000-metre tall pyramid, 12 times higher t

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问题     Pyramid City is an even more ambitious project to solve Tokyo’s housing
problem. A 1 ,000-metre tall pyramid, 12 times higher than the Great
Pyramid of Giza in Egypt, would contain 55 smaller pyramids, each of them 【M1】______
would be the size of the Giza original. If it is built, the pyramid will
consist in a series of skyscrapers suspended from the inside of the structure, 【M2】______
the pyramid will be 80 storey high, with parkland in-between the skyscrap- 【M3】______
ere. Three quarters of a million of people will live there. The skyscrapers will 【M4】______
be linked by series of hollow tubes containing a high-speed transport system. 【M5】______
Parts of the construction, include more than 150 kilometers of tunnels, will be 【M6】______
built by spider robots, and power will be provided by waves and wind.
    A major problem is that Japan is situating on the seismic "ring of fire"— 【M7】______
an area of volcanic activity where stretches around the Pacific Ocean. 【M8】______
Pyramid City will have to withstand earthquakes, tsunamis and underwater 【M9】______
volcanic eruptions.
    The designers of Pyramid City are certain that it will be built and make 【M10】______
safe from earthquakes, but probably not for another 100 years.
【M1】

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答案them改为which

解析 (该句为非限定性宾语从句。)
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