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单项选择题

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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