单项选择题

The main role of some dinosaurs' developed primitive feathers is to_____.

A．fly
B．fight
C．keep warm
D．frighten the enemy
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单项选择题
The main idea of the text is_____.
A．the Dromaeosanr's skeleton was found
B．fossil dinosaur reveals body covered in feathers
C．modern birds evolved from dinosaurs
D．a recent new invention
单项选择题
From the text we can deduce that modern birds evolved from dinosaurs _____.
A．is approaching solution
B．remains a debate
C．is apparent
D．is impending
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