单项选择题

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A. $4.
B. $40.
C. $200.
D. $2,000.

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单项选择题
According to the passage, biosphere is the layer on the earth’s surface where ().

A. the atmosphere meets the land
B. various living things normally live
C. plant and animal life can exist
D. earthworms and other invertebrates live

单项选择题
The cases of the Ivy Leagued student and the N.Y.U. student are mentioned to show us that ()

A. many students have realized that they are used as free labor
B. many employers make an excuse for their illegal abuses
C. some inexperienced students haven’t established correct view of occupation choice
D. some unpaid internships involving lots of unskilled work are illegal

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