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As evidence that the Earth’s atmosphere is warming continues to accumulate, scientists are making slow progress toward an answer to the big question raised by the evidence: How much of the warming is due to human activity and how much to natural causes

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标杆管理的概念是什么请列举几种常见的标杆管理方法。

一患者，腰痛伴左下肢痛麻2个月，行走时呈间歇性跛行。查体：L4～S1左椎旁压痛，局部叩击痛(+)，并向左下肢放射至足大躖趾，左膝反射减弱，左小腿外侧及足背侧皮感减退。该患者可能突出的节段为

A. L1～2和L2～3
B. L2～3和L3～4
C. L3～4和L4～5
D. L4～5和L5～S1
E. L2～4和L4～5

在社会主义初级阶段，我国尚不具备社会主义社会的一般特征。( )

A. 对
B. 错

The conference was postponed because of a(n) ______ (expected) event.