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
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.
单项选择题
What possibly resulted in the evolution from leafless tree to flat leaves
A．The decrease CO2 in levels.
B．The increase of forests.
C．The drop of temperatures.
D．The change of climates like today.
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