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.Tramplin
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单项选择题
Ernest Hemingway's first book was published in______.
A.1923
B.1924
C.1926
D.1929
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