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
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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
单项选择题
What can people know from the crown of an ancient tree found in New York
A．It helps people know that ancient trees have no trunk.
B．It provides us new information about the appearance of the earliest forest.
C．It provides evidence for the existence of trees 397 million years ago.
D．It provides evidence for the bloom of trees 397 million years ago.
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