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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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71. 72. 73. 74. 75 71. G 72. D 73 .B 74. C 75. A
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(答案→)71. G 72. D 73 .B 74. C 75. A
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