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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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.
单项选择题
According to the author, there was once a trend in the U. S. ______.
A．for middle class young adults to stay with their parents
B．for young adults to leave their parents and live independently
C．for married young adults to move back home after a lengthy absence
D．for young adults to get jobs nearby in order to live with their parents
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