单项选择题

A．Find his glasses.
B．Sit up straight.
C．Get enough rest.
D．Change his tires.
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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.
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.
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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