2. 外语
  3. Environment has taken rather a back seat politically since the Earth summit in Rio de Janeiro nearly five years ago. 【C1】______t

Environment has taken rather a back seat politically since the Earth summit in Rio de Janeiro nearly five years ago. 【C1】______t

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问题    Environment has taken rather a back seat politically since the Earth summit in Rio de Janeiro nearly five years ago. 【C1】______the problems that meeting【C2】______had not gone a-way. One environment【C3】______tank—the International Food Policy Research Institute—has been looking at the future of water and【C4】______report reflects growing concern at the huge leap in usage over the past few years. In some parts of the world, water consumption has【C5】______five fold. And the institute, known by its【C6】______ says shortages could soon become the【C7】______for conflict and a major barrier to【C8】______the world’s growing population. Here’s Richard Black of our Science Unit.
   It’s often been said that water【C9】______oil will be the cause of warfare in the next century. According to the IFPRI report, the time【C10】______that happens might not be far away. The number of people【C11】______by water shortages will increase ten【C12】______over the next 30 years, it says, 【C13】______could well lead to large scale conflicts.
   The main reason why water is becoming a【C14】______resource is agriculture, which now【C15】______70% of water consumption worldwide, 90% in some【C16】______countries. Countless farmers have switched from growing indigenous crops for the【C17】______market to high yield export varieties, which【C18】______need far more water. But the IFPRI report says that in some regions water shortage is now the single biggest impediment to feeding the population. Water scarcity【C19】______leads to water pollution. In the Indian State of West Bengal, for example, over extraction of water from boreholes has led to arsenic poisoning which is【C20】______to have affected two million people so far. But the IFPRI report calls for better water management worldwide including financial incentives to encourage conservation.
【C10】
选项 A、which
B、how
C、why
D、when
答案D
解析 由空格前面的“the time”可知，该从句为时间状语从句，空格处应为时间状语从句引导词，因此选择D。
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