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

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热门试题

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

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