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.

<上一题目录下一题>

热门试题

单项选择题

The phrase catch on (Line 1,Para.3) most probably means ______.

A．interfere
B．prevail
C．perceive
D．continue

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.