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题目内容
（西安石油大学大学英语I（下））
Which of the following is NOT a reason for American presidents to live longer?(本题2.5分)
A、 They have better genes for long life. √
B、 They have the best doctors and medicine.
C、 They have higher social and economic status.
D、 They have good education and try to keep healthy.
A、 They have better genes for long life. √
B、 They have the best doctors and medicine.
C、 They have higher social and economic status.
D、 They have good education and try to keep healthy.
参考答案