What do we know about Bluetooth?A、It is a talking software.
B、It is named after a Danish king.
C、It is widely used in internet purchases.
D、It is a remote controller to turn on your phone.
【正确答案】：A
【题目解析】：事实细节题。第二段……named after a 10th century Danish king famed for……可知B选项是错误的；第三段可知A选项是正确；第三段最后一句话可知D选项是错的；C选项无从得知。