单项选择题

The author implies that reptiles ______.

A．have four-chambered hearts
B．have one aorta
C．are cold-blooded
D．are faster and have more endurance than mammals
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单项选择题
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.
单项选择题
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.
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.
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