2. 自考
  3. A. industrially polluted soils B. once they entered the food chain. C. naturally polluted soils D. the geology and geochemistry

A. industrially polluted soils B. once they entered the food chain. C. naturally polluted soils D. the geology and geochemistry

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问题 A. industrially polluted soils
B. once they entered the food chain.
C. naturally polluted soils
D. the geology and geochemistry of the environments
E. the element of iodine
F. not found so far
It is extremely necessary to study the long-term effects caused by living on______.
选项
答案C
解析 本句应定位在第五段中“There is a vital need to understand the potential risks andlong-term health effects of living on naturally contaminated soils．”由此可以看出，尽管目前还未发现相关证据，但是深入了解生活在自然污染后的土地上可能存在的风险和长期的健康影响仍然十分必要。
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