填空题

【参考答案】

is—was
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单项选择题
America's first backbone Internet Service provider was ______.
A．EarthLink
B．MCI
C．GTE Corp
D．NSFNET
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.
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