单项选择题

According to the passage, wireless network has an advantage over the three products mentioned in ______.

A．simplicity
B．speed
C．safely
D．price
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单项选择题
The promising idea mentioned in the first paragraph ______.
A．has mature technology to support it
B．has a stable early application—the Xl0 system
C．is to transmit data by power lines within the house
D．fostered products which affected wireless network
单项选择题
It can be inferred from the passage that the new products of Panasonic, Netgear, Marantz ______.
A．can directly move data by home electrical wiring
B．are adapters or a similar system to transfer data
C．provide the present Wi-Fi criteria for wireless networking
D．were produced for home electrical lines last month
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