填空题

This article mainly tells us why dinosaurs ate grass.

【参考答案】

N
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填空题
The outlines of easily visible leaves and stems cannot be found in fossils older than tiff million years.
单项选择题
We can infer from the passage that the appearance of immortal life is ______.
A．only a matter of time
B．far from certain
C．just an illusion
D．a fading hope
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