om their natural enemy
[D] were good for insulation
4. The original purpose of feather was___________.
[A] to help dinosaurs fly
[B] to keep dinosaurs warm
[C] to distract predators
[D] a mystery
5. We learn from the last paragraph that __________.
[A] a baby dinosaur looks like a bird
[B] T-rex is a kind of dinosaur figure familiar to kids
[C] living feathered dinosaurs can still be found in certain parts of the world
[D] scientists understand precisely how and why feathers first arose
答案：A C D D B
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