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题目材料:

According to the passage, which of the following is true regarding environmental changes 4,000 years ago?
  • ANo localized increases in grass pollen were caused by agricultural development.
  • BIncreases in grass pollen were at least sometimes a reflection of an increase in aridity.
  • CWholesale ecosystem changes probably resulted from agricultural development.
  • DAny small-scale changes occurring then would not be detectable now.
  • EEnvironmental change helped induce the adoption of agricultural technologies.

B显示答案

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