Although Brazil has its share of environmental and social problems, it has its successes too. One of these is the town of Curiti

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问题     Although Brazil has its share of environmental and social problems, it has its
successes too. One of these is the town of Curitiba, which the authorities have 【M1】______
shown evidence of a strong vision and commitment to good environment 【M2】______
practice. In the shanty towns there are no flies or litter, because there is voluntary 【M3】______
recycling system. A constantly procession of women and children bring rubbish 【M4】______
they have been collected in bags or on wheelbarrows: for a kilo of litter they are 【M5】______
given a kilo of potato and one banana. So the streets stay clean, and people 【M6】______
don’t hurry. Public transport has also been transformed. The buses are of the 【M7】______
latest design with platform that open out at the same time as the doors, 【M8】______
enabling a large number of passengers board quickly. People buy their tickets 【M9】______
beforehand to save time, and the buses travel in their designate lanes. These 【M10】______
recent initiatives have reduced traffic delays in the rush hour.
【M3】

选项

答案is∧voluntary--a

解析 (recycling system指“再循环系统”,此处system为及物动词,因此is后应加入不定冠词a。)
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