单项选择题

America's first backbone Internet Service provider was ______.

A．EarthLink
B．MCI
C．GTE Corp
D．NSFNET

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单项选择题

Which of the following is NOT a cause of the problem under discussion

A．Over-grazing.
B．Radioactive contamination.
C．Poaching.
D．Trampling.

单项选择题

Which of the following books won Hemingway a Pulitzer Prize

A．The Old Man and the Sea.
B．The Green Hills of Africa.
C．A Farewell to Arms.
D．For Whom the Bell Tolls.

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