You are working on a project for Bright Idea Inc．and working on a project for a large retail bank．You have already prepared the WBS and got it signed off．Because of some new government regulations，you need to add some more activities to the WBS．You have got the change requests approved through the CB．The WBS changes in turn require which of the following ？（）

A．Cost change

B．Scope change

C．Schedule revision

D．Risk response chang

男性，60岁，6小时前双大腿中段被汽车撞伤。查体：脉率120次/分。血压70/50mmHs。双大腿中段严重肿胀，有骨擦音及反常活动，足背动脉可扪及。x线片示双股骨中段斜形骨折

经过骨牵引治疗1周后，生命体征平稳，局部皮肤正常。x线片示2处骨折复位均较差，有重叠成角移位。此时最好的治疗方法是( )

A．继续调整牵引角度，加大牵引重量
B．改用小夹板外固定
C．小夹板外固定+骨牵引
D．手法复位+双侧髋人字石膏外固定
E．切开复位内固定