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.
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单项选择题
What's this 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.
单项选择题
According to the fossil reconstruction, what main parts did a tree comprise
A．It comprised a trunk, vertical ridges and palms.
B．It comprised leaves, ferns and palms.
C．It comprised stumps, branches and palms.
D．It comprised a base, a trunk and a crown.
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