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

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热门试题

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

单项选择题

The Chickscope Project enabled students to do all of the following EXCEPT ______.

A．to set up an incubator to hatch chicks
B．to actually operate an MRI system
C．to get involved in actual research
D．to watch the changes in the chick embryo