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According to the author, if the 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The sharp rise of the snow geese population is mainly caused by______.

A．lack of natural enemies
B．great care of wildlife preservationists
C．favorable conditions in their winter habitat
D．changes in their migration patterns