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．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According to the author, if the northern marshes are destroyed,______.

A．the snow geese will be in danger
B．the agriculture of the area will suffer
C．the Canada geese will replace the snow geese
D．the snow geese may move to breed in Minnesota

单项选择题Judging by the passage, biologist David Anderson ______.

A．seemed to be interested in marathon
B．made use of a satellite in his research
C．was probably a specialist in remote education
D．put together multimedia presentations for NSF