单项选择题

WELTER:

A． persuasive comment
B． questionable gathering
C． tidy order
D． odd nature
E． lavish enlargement

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单项选择题

FORMIDABLENESS:

A． interest
B． distraction
C． premonition
D． loathing
E． objection

单项选择题

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． determining which species of dinosaurs were most likely to be warm-blooded, and focusing research there

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