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.

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热门试题

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.

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.