GRE考试

根据网考网考试中心的统计分析，以下试题在2018/8/19日GRE考试习题练习中，答错率较高，为：66%
【单选题】According to the passage, the most severe problem currently facing scientists in conclusively determining whether certain dinosaurs were warm-blooded is


A．proving that thermoregulation is the primary means by which metabolic rates are influenced
B．developing a way of distinguishing between oxygen 18 and oxygen 16
C．showing that an absence of seasonal variation in oxygen 16 implies a constant internal temperature
D．finding a sample of dinosaur tissue which has survived 65 million years in a relatively intact form
E．(E) determining which species of dinosaurs were most likely to be warm-blooded, and focusing research there