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单项选择题

A．Put the briefcase back in the elevator.
B．Contact the owner of the briefcase.
C．Find out if the receptionist lost a briefcase.
D．Take the briefcase to the reception desk.
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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

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.