we can learn about the lives of dinosaurs from fossils of their skeletons ,eggs and footprints

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• 1.昨天,我爸爸给我买了一辆自行车.My father()()()yesterday.2.吃过午饭后,工人们继续下地干活.（）（）lunch,the workers continued working in the fields.3.那条巨型犬和他主人一样高.That huge dog is （）（）（）its owner.4.你发生什么事了?（）（）（）you?5.人们能从恐龙的骨骼、蛋及脚印的化石上了解它们的生活.People can（）（）the lives of dinosaurs（）fossils of their skeletons,eggs and footprints.
• We know about the lives of dinosaurs from the skeletons,eggs.We know about the lives of dinosaurs from the skeletons,eggs and footprints they left behind.they left behind在此时从句么?是什么从句
• we can learn about the lives of dinosaurs from fossils of their skeletons ,eggs and footprintsthe lives of ...不是说life 做生活讲是不可说的吗,怎么这里用的复数
• However,people can learn about the lives of dinosaur from fossils of their skeletons,中文是?
• 英语翻译请不要从翻译器直接翻译,如果可以,我也不会打出来求救.】Dinosaurs lived on Earth more than 60million years before human beings.They lived everywhere on Earth.Some dinosaurs were as small as chickens.Others were as big as ten elephants.Some could even fly.Many dionsaurs ate plants.However,some dinosaurs liked to eat meat.Dionosaurs lived on Earth for more than 150 million years.Then,suddenly,they all died out.Nobody knows why.However,we can learn about them from their fossils
• we can learn about the lives of dinosaurs from fossils of their skeletons ,eggs and footprints
• However,people can learn about the lives of dinosaur from fossils of their skeletons,中文是?
• We know about the lives of dinosaurs from the skeletons,eggs.
• they left behind是什么意思是we know about the lives of the dinosaurs （恐龙）from the eggs and footprints they left behind
• 1.√12+3√(4/3)-√(16/3)-(2/3)√48
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