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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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
Why was it possible for these ancient trees let more light through than modern ones
A．Because they were closely spaced, only 3 to 16 feet apart.
B．Because they were smaller plants and shrubs.
C．Because their branches did not fan out as far as to form a shape like umbrella.
D．Because they had very small leaves like that of fern and dropped easily.
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