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
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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
单项选择题
The phrase catch on (Line 1,Para.3) most probably means ______.
A．interfere
B．prevail
C．perceive
D．continue
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