19. According to the passage, late seventeenth and early eighteenth-century Chinese records are important for which of the following reasons?
They suggest that the data on which the Maunder minimum was predicated were incorrect.
They suggest that the Maunder minimum cannot be related to climate.
They suggest that the Maunder minimum might be valid only for Europe.
They establish the existence of a span of unusually cold weather worldwide at the time of the Maunder minimum.
They establish that solar activity at the time of the Maunder minimum did not significantly vary from its present pattern.
20. The author implies which of the following about currently available geological and archaeological evidence concerning the solar-activity cycle?
It best supports the model of solar activity described in lines 37-45.
It best supports the model of solar activity described in lines 45-52.
It is insufficient to confirm either model of solar activity described in the third paragraph.
It contradicts both models of solar activity as they are presented in the third paragraph.
It disproves the theory that terrestrial weather and solar activity are linked in some way.
21. It can be inferred from the passage that the argument in favor of the model described in lines 37-45 would be strengthened if which of the following were found to be true?
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