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  3. Because dinosaurs were reptiles, scientists once assumed that, like all reptiles

Because dinosaurs were reptiles, scientists once assumed that, like all reptiles

游客2025-02-26  21
问题 Because dinosaurs were reptiles, scientists once assumed that, like all reptiles alive today, dinosaurs were coldblooded. The recent discovery of dinosaur fossils in the northern arctic, however, has led a number of researchers to conclude that at least some dinosaurs might have been warmblooded. These researchers point out that only warm-blooded animals could have withstood the frigid temperature that are characteristic of arctic winters, whereas cold-blooded animal would have frozen to death in the extreme cold. Which one of the following, if true, weakens the researchers’ argument?
选项 A、Today’ s reptiles are generally confined to regions of temperate or even tropical climates.
B、The fossils show the arctic dinosaurs to have been substantially smaller than other known species of dinosaurs.
C、The arctic dinosaur fossils were found alongside fossils of plants known for their ability to withstand extremely cold temperatures.
D、The number of fossils found together indicates herds of dinosaurs so large that they would need to migrate to find a continual food supply.
E、Experts on prehistoric climate conditions believe that winter temperatures in the prehistoric northern arctic were not significantly different from what they are today.
答案 D
解析 读题以后不难发现本题的结论是以史前时代北极地区的气温与今天的相比无明显差别以及化石被科学家们在北极发现的恐龙生前就一直栖息在北极为前提.选项(D)通过找他因，削弱了本题结论的前提，因此(D)是正确答案；(E)对结论构成支持；(A)、(B)和(C)均为无关选项。
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