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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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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