单项选择题

According to the author, what theory was previously held and now is being questioned

A．That dinosaurs were warm-blooded.
B．That dinosaurs had four-chambered hearts.
C．That dinosaurs were swifter and stronger than reptiles.
D．That dinosaurs were cold-blooded.
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单项选择题
The author implies that birds ______.
A．move faster and have greater endurance than reptiles
B．move slower and have less endurance than reptiles
C．move faster and have greater endurance than dinosaurs
D．move slower and have less endurance than dinosaurs
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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