单项选择题

According to the passage, wireless network has an advantage over the three products mere tioned in_______.

A．simplicity
B．speed
C．safety
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 X10 system
C．is to transmit data by power lines within the house
D．fostered products which affected wireless network
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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