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【单选题】
According to the passage, the most severe problem currently facing scientists in conclusively determining whether certain dinosaurs were warm-blooded isA.
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.
determining which species of dinosaurs were most likely to be warm-blooded, and focusing research there
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【简答题】下列选项中属于经济法律行为的是（ ）。
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