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

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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

According to the passage what is the best for both parents and children

A．They should adjust themselves to sharing the family expenses.
B．Children should leave their parents when they grow up.
C．Adult children should visit their parents from time to time.
D．Parents should support their adult children when they are in trouble.