深港版英语五上unit5dinosaurs一

深港版英语五上unit5dinosaurs一内容摘要：

y the extinction occurred. The most widely accepted theory is that an asteroid impact caused major climactic changes to which the dinosaurs couldn39。 t adapt. Dinosaurs probably live on today as the birds. All that39。 s left of the dinosaurs are fossils and, perhaps,the birds. Dinosaur fossils have been found all over the world, maybe even near where you live! Some dinosaurs were very birdlike and may be the ancestors of today39。 s birds. There are almost 500 described dinosaur genera and many more species. Every few months (sometimes weeks), new finds are unearthed. Although dinosaurs39。 fossils have been known since at least 1818, the term dinosaur (deinos means terrifying。 sauros means lizard) was coined by the English anatomist Sir Richard Owen in 1842. The only three dinosaurs known at the time were Megalosaurus, Iguanodon, and Hylaeosaurus, very large dinosaurs. The oldest known dinosaur is Eoraptor, a meateater from about 228 million years ago. ACTIVITIES THAT ACCOMPANY THIS PAGE  Find It! A printout for 2nd Graders. Skills: reading, writing, research, and prehension.  Word Unscramble A printout for 3rd Graders. Do this writing/spelling activity after (or while) reading this page. Unscr。