7. Which of the following best describes the function of the highlighted sentence in the context of the passage as a whole?A. It provides an example of the kind of problem that often complicate investigations into environmental change.B. It calls into question the reliability of the established dates for later Holocene agricultural development. C. It describes the nature of localized agricultural developments during the later Holocene.D. It outlines a hypothesis that draws on evidence discussed earlier in the passage.E. It limits the scope of a particular complication mentioned earlier in the passage.8. According to the passage, which of the following is true regarding environmental changes 4,000 years ago? A. No localized increases in grass pollen were caused by agricultural development.B. increases in grass pollen were at least sometimes a reflection of an increase in aridity. C. Wholesale ecosystem changes probably resulted from agricultural development.D. Any small-scale changes occurring then would not be detectable now.E. Environmental change helped induce the adoption of agricultural technologies.
đang được dịch, vui lòng đợi..