单项选择题

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

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填空题
(38) should be filled in （）
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
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