A. secret key
B. double keys
C. missing key
D. public key
第1题
Getting to a U.S. site from outside this country is quite ()
A. transparent
B. instantaneous
C. complicated
D. accurate
第2题
the Amazon.com business model combines()
A. direct marketing
B. the intermediary role
C. virtual community
D. content provider
第3题
brokerage models include()
A. marketplace exchange
B. content-targeted advertising
C. buy/sell fulfillment
D. bounty broker
第4题
()may be the major or sole source of revenue for the broadcaster.
A. The banner ads
B. portal
C. product catalog
D. content
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