阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。Being the main river of Paris, the Seine River, over the centuries, has functioned as a 【小题1】 (protect) barrier, a water source and a place for washing clothes, National Geographic reported.
Many of the city’s iconic landmarks and structures, such as the Eiffel Tower, the Louvre Museum, and Place de la Concorde, 【小题2】(situate)along its banks.
However, Paris has faced many challenges in its efforts to clean up the Seine 【小题3】 time for the 2024 Olympics. The river will be the venue for swimming marathon events. In the 17th century, swimming in the Seine was very popular. But for the last hundred years, it 【小题4】 (prohibit) due to health and safety concerns.
Over the past decade, Paris has investigated about 1. 4 billion euros 【小题5】(restore)the river’s ecosystem. 【小题6】, test results in April still showed high levels of bacteria in the collected samples from the river.
The city built a giant storage basin capable of holding 46, 000 cubic metres of waste water. The basin is 30 metres deep and 【小题7】 size of a dozen Olympic swimming pools. Once the rain is collected, it will be moved through a tunnel to a 【小题8】(treat) plant. When the water in the basin meets the 【小题9】 (require) health criteria it will then be poured into the Seina.
“It’s feasible to clean up a river because the water’s flowing,” Ted Steiner, professor of medicine at the University of British Columbia, told Golbal News. “Especially if you’ve got the appropriate volume of water running through the river, things get diluted(稀释) to a point 【小题10】 there’s not a whole lot of risk.”