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54. 请指出下列代词指代A major drawback of vertical farming, however, is that the plants would require artificial light. Without it, those plants nearest the windows would be exposed to more sunlight and grow more quickly, reducing the efficiency of the system.这里的 it 指______

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53.请指出下列代词指代Although the system would consume energy, it would return energy to the grid via methane generation from composting non-edible parts of plants. It would also dramatically reduce fossil fuel use, by cutting out the need for tractors, ploughs and shipping.这里的 it 指______

52. 分析下列句子One such proposal is for the 'Vertical Farm'. The concept is of multi-storey buildings in which food crops are grown in environmentally controlled conditions. Situated in the heart of urban centres, they would drastically reduce the amount of transportation required to bring food to consumers.(1) 这里的 they 指______ (2) situated 的逻辑主语是 ______

51. 请指出下列代词指代Other scientists have written books to explain their fields to non-scientists, but have necessarily had to omit the mathematics, although it provides the foundation of their theories.这里的 it 指______

48. 完成下列句子分析Perhaps one of the most obvious examples of this idea is malaria-prone areas, which are usually tropical regions that foster a warm and damp environment in which the mosquitos that can give people this disease can grow.(1) 第一个which 修饰的先行词是 ______ (2) 第二个 in which 修饰的先行词是 ______ (3) in which 这个定语从句内 the mosquitos 对应的谓语 ______ (2个单词)

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