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【单选题】
Which of the following is(are) legitimate statement(s) about search engine’s business?A.
Search engine can be considered as “free” because we do not pay directly to a search engine to do a search
B.
Search engine can be considered as “not free” because each search generates a carbon footprint that can potentially damage our shared environment which is a common good
C.
Search engine can be considered as “not free” because the price of merchandise that we buy, having advertising on the search engine, includes charges from that search engine
D.
All of the options given
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