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Compared with Arizona's Pima Indian, Pima diet in Mexico remains healthy because ______.

A. they are far away from America
B. they are thin
C. they lives comfortably than those Arizona's Pima
D. they don't follow Americans to eat junk food

定金合同为诺成合同。()

A. 正确
B. 错误

2岁以上,以间质性角膜炎、马鞍鼻、神经性耳聋等特征常见,可见于:

买进套期保值的目的是锁定卖出价格,免受价格下跌的风险。()

A. 正确
B. 错误

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