单项选择题

For which of the following reasons are late seventeenth and early eighteenth century Chinese records important according to the passage

A．They suggest that the data on which the Maunder minimum was predicated were incorrect.
B．They suggest that the Maunder minimum can not be related to climate.
C．They suggest that the Maunder minimum might be valid only for Europe.
D．They establish the existence of a span of unusually cold weather worldwide at the time of the Maunder minimum.
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单项选择题
It can be inferred from the passage that studies attempting to use tree-ring thickness to locate possible links between solar periodicity and terrestrial climate are based on the assumption that ______.
A．the solar-activity cycle existed in its present form during the time period in which the tree rings grew
B．the biological mechanisms causing tree growth are unaffected by short-term weather patterns
C．average tree-ring thickness varies from species to species
D．tree-ring thicknesses reflect changes in terrestrial climate
单项选择题
The author focuses primarily on______.
A．presenting two competing scientific theories concerning solar activity and evaluating geological evidence often cited to support them
B．giving a brief overview of some recent scientific developments in solar physics and assessing their impact on future climatological research
C．discussing the difficulties involved in linking terrestrial phenomena with solar activity and indicating how resolving that issue could have an impact on our understanding of solar physics
D．pointing out the futility of a certain line of scientific inquiry into the terrestrial effects of solar activity and recommending its abandonment in favor of purely physics-oriented research
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