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  3. It was previously believed that dinosaurs were cold-blooded creatures, like

It was previously believed that dinosaurs were cold-blooded creatures, like

游客2023-07-28  27
问题     It was previously believed that dinosaurs were cold-blooded creatures, like reptiles. However, a recent discovery has lad researchers to believe they may have been warm- blooded. The fossilized remains of a 66 million-year-old dinosaur’s heart were discovered and examined by x-ray. The basis for the analysis that they were warm- blooded is the number of chambers in the heart as well as the existence of a single aorta (主动脉).
    Most reptiles have three chambers in their hearts, although some do have four. But these that have four chambers, such as the crocodile, have two arteries (动脉) to mix the oxygen-heavy blood with oxygen-lean blood. Reptiles are cold-blooded, meaning that they are dependent on the environment for body heat. Yet the fossilized heart had four chambers in the heart as well as a single aorta. The single aorta means that the oxygen-rich blood was completely separated from the oxygen-poor blood and sent through the aorta to all parts of the body.
    Mammals, on the other hand, me warm-blooded, meaning that they generate their own body heat end are thus mere tolerant of temperature extremes. Birds and mammals, because they are warm blooded, move more swiftly and have greater physical endurance than reptiles.
    Scientists believe that the evidence now points to the idea that all dinosaurs were actually warm- blooded. Ironically, the particular dinosaur in which the discovery was made was a Tescelosaurus, which translates to "marvelous lizard." A lizard, of course, is a reptile. [br] What does the author imply by the sentence: Ironically, the particular dinosaur in which the discovery was made was a Tescelosaurus, which translates to "marvelous lizard."?
选项 A、It is paradoxical that the dinosaur’s name includes the word lizard, because now scientists believe it is not a lizard.
B、It is unusual that the creature would have a name with the suffix of a dinosaur.
C、It is surprising that the fossilized heart was discovered.
D、It should have been realized long ago that dinosaurs were warm-blooded.
答案 A
解析 A中的paradoxical“自相矛盾的”与原文中的ironically意义接近。文中的句子说明这种恐龙名字的含义 marvelous lizard与最近的发现相矛盾，因为恐龙不是lizard。
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