A． It's a startup founded by Andrew Littlefiel
B． Its headquarters is located in San Francisc
C． Its newly launched virtual world has the features of nightclubs and billboard
D． The business model adopted for its virtual world is search advertisin
【解析】选项B和C与第1段第1句相对应；选项A与第4段第3句相对应；而选项D与第2段第1句所述“Doppelganger就在其虚拟世界”休闲吧“中采用了嵌入式产品广告”这一信息点不符，因此选D。
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A． product-placemen
B． social networkin
C． instant messagin
D． musi
A． whether they can get additional venture capital from investment bank
B． whether they can increase revenue from selling music downloads and band-related good
C． whether they can find suppliers to sell physical things in the Loung
D． whether they can develop a critical mass of users and attract mass-market advertiser