单项选择题

What's the passage mainly about

A．The internal structure shows how ancient trees grew.
B．The CO2 lever exerts impact on the leaves of ancient tress.
C．Analysis of ancient fossils paint picture of the Earth's earliest trees.
D．The ancient trees have no leaves and few branches.
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单项选择题
Who will probably most welcome the three products
A．People whose house has no space for wireless system.
B．People whose house cannot receive images, sounds or messages.
C．People who have no extra money to afford wireless system.
D．People who prefer to do things in a simpler way.
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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