A-A+
What is the basis of the researchers' new theo
问题详情
What is the basis of the researchers" new theory？
A．They performed mathematical calculations and determined that dinosaurs must have had four chambered hearts.
B．They found a fossil of an entire dinosaur end reviewed the arteries and veins flowing from and to the heart.
C．They found a fossil of a dinosaur"s heart and discovered it had four chambers and one aorta.
D．They viewed a fossil of a dinosaur"s heart and discovered that it had two aortas.
参考答案
正确答案：C
解析：文章第一段最后一句话直接指出“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)．”恐龙是恒温动物这一分析研究结果的基础在于恐龙心室的数量和它们都有一根主动脉。所以C正确。
