“入山见木，长短无所不知；入野见草，大小无所不识。然而不能伐木以作屋，采草以和药，此知草木所不能用也。”造成上述现象的根本原因是                                 

A．不懂得实践是认识的来源

B．不懂得实践是认识的目的

C．不懂得实践是认识发展的动力

D．不懂得实践是检验认识真理性的唯一标准

All of the following is true for a project baseline EXCEPT ______.

A) it is the original approved plan
B) it includes approved scope changes
C) it is useful in detecting project variances
D) it is useful in preparing the WBS