Passage Two
Unlike modern animal scientists, dinosaur scientists cannot sit on a hillside and use telescopesto watch dinosaurs in order to know how they lived and whether they were good parents. Instead, theyhave to search hard for information from dinosaurs' fossils (恐龙化石)because dinosaurs died outmillions of years ago.
It's very difficult for the scientists to reach an agreement because different results can be gotfrom the same fossils. Many fossils of the same kind of dinosaurs have been dug out from oneplace. They might have formed when an entire group of dinosaurs got stuck (陷人) all at once. Orthey 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 inthe second lived alone.
Though there are two different results, dinosaur scientists now generally agree tha~" at least somekinds of dinosaurs lived in big groups. "That's pretty much settled at this point," says Paul Sereno.A kind of dinosaurs called Sauropods left behind tracks in the western United States that appear torun 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 liv-ing relatives of dinosaurs--birds and crocodiles--for possible models. Birds give a lot of care to theiryoung, while crocodiles just help their young to the water. The discovered fossils of dinosaurs sittingon their eggs and staying with their young suggest the parents were taking care of their babies, but westill cannot say that all dinosaurs did the same.
There is still a long way to go before the above questions could be answered. Dinosaur scientists will have to find more proof to reach an agreement.
( )40. Which of the following is TRUE according to the 4th paragraph?
A. Birds hardly pay attention to their young.
B. Baby crocodiles can look after themselves well.
C. Some dinosaurs took care of their young.
D. Birds and crocodiles take good care of their young.
答案：C
( ) 41. Dinosaur scientists can get information directly by __
A. studying dinosaur fossils
B. examinipg modern animals
C. watching dinosaurs
D. using tel'es~opes
答案：A
( )42. What is pretty much settled according to Paul Sereno?
A. Half of the dinosaurs lived alone.
B. Most dinosaurs moved long distances.
C. Many dinosaurs settled in the north.
D. Some dinosaurs lived in big groups.
答案：D
( ) 43. Dinosaur scientists can probably know whether dinosaurs were good parents by __
A. watching many kinds of animals
B. studying dinosaurs' living relatives
C. following the tracks left behind
D. working on dug-out dinosaur eggs
答案：B
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