问题
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The theory that the impact of a giant meteorite caused the extinction of the dinosaurs is
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The discovery of a new type of ceratopsian dinosaur suggests ceratopsians ______.A.migrate
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A.The increase of human population.B.The extinction of dinosaurs.C.The cutting down of
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What is the significance of the newly discovered fossils?A.To provide new evidence of the
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In 2012, Dr. Schwaitzers discovery of the same protein in dinosaurs and modern birds could
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What is the main idea of the news item?A.Dinosaurs died out 65 million years ago.B.Cause o