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55. 分析下列句子People wanted to buy photographs as souvenirs of a trip or as gifts, and catering to this market, Henderson had stock photographs on display at his studio for mounting, framing, or inclusion in albums.(1) 和 souvenirs 并列的是 (2) for 后面并列的成分有几个（请用阿拉伯数字作答）

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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______

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______