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Unlike modern animal scientists , dinosaur (恐龙) scientist cannot sit on a hillside and use telescope to watch dinosaurs in order to know how they lived and whether they were good parents .
71 .
It’s very difficult for the scientists to reach an agreement because different results can be got from the same fossils(化石) .
72 . They might have formed when an entire group of dinosaurs got stuck all at once, or they might have been the result of dinosaurs getting stuck one after another over a course of a few centuries . Thus we can say that dinosaurs might have in the first case lived in big groups and in the second lived alone .
73 . A kind of dinosaurs called Sauropods left behind tracks in the western United States that appear to run north and south , suggesting that they even moved long distances together .
As to whether dinosaurs cared for their young , dinosaur scientists have turned to the closest living relatives of dinosaurs —birds and crocodiles — for possible models .
74 . The discovered fossils of dinosaurs sitting on their eggs and staying with their young suggest the parents were taking care of their babies , but we still cannot say that all dinosaurs did the same .
75 . Dinosaur scientists will have to find more proof to reach an agreement .
| A．There is still a long way to go before the above questions could be answered . |
B．Though there are two different results , dinosaur scientists now generally agree that at least some kinds
of dinosaurs lived in big groups . |
| C．Birds give a lot of care to their young , while crocodiles just help their young to the water . |
| D．Many fossils of the same kind of dinosaurs have been dug out from one place . |
E. Half of the dinosaurs lived alone .
F. Birds hardly pay attentions to their young .
G. Instead , they have to search hard for information from dinosaur’s fossils .
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