单项选择题

The author seems to imply that ______.

A．humans are responsible for the problem
B．hunting limits and regulations should be lifted
C．the birds have a strong capability to survive
D．the Canada geese are a better species than the snow geese
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单项选择题
On which of the following assumptions is based the belief, that tree-ring thicknesses show links between solar periodicity and terrestrial climate
A．Solar-activity cycle existed m its present form during the period in question.
B．Average tree-ring thickness varies from species to species.
C．Tree-ring thickness varies with changes in terrestrial climate.
D．Both terrestrial climate and solar-activity cycle randomly affect tree-ring thickness.
单项选择题
The author focuses primarily on ______.
A．two competing scientific models concerning the sun's magnetic field
B．an overview of some recent scientific developments in solar physics
C．the reasons why a problem in solar physics has not yet been solved
D．the difficulties involved in linking terrestrial climate with solar activity
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