合同的当事人，可以是自然人，也可以是（）或其他经济组织。
参考答案：法人
读下面的"地质剖面示意图"，回答问题。
下列各种岩石和岩浆之间的转换过程中，正确反映地壳物质循环的是（）。
A.①-②-③-④-①
B.③-⑤-①-④-③
C.③-①-④-②
D.②-④-①-⑤
Which of the following describes a preterm neonate
A．A neonate weighing less than 2,500 g (5 lb, 8 oz).
B．A low-birth-weight neonate.
C．A neonate born at less than 37 weeks' gestation regardless of weight.
D．A neonate diagnosed with intrauterine growth retardation.
