正确答案: D

不定期

题目：甲租乙住房一套，口头约定租期1年。后双方因租赁期限发生争议。依据《合同法》，该租赁合同的租赁期限为

解析：D

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学习资料的答案和解析：

[单选题]Passage ThreeMany theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form. a crust of rock that was many miles thick.

the origin of the ocean

解析：

41．答案为B。根据第一段第一、二句，Many theories about the origin of the ocean have been proposed by scientists．The most widely accepted one is that...作出该项选择。

[单选题]体内C02分压最高的是 （ ）

细胞内液