题目

It seemed that he was trying to        his own responsibility for the delay, instead of accepting his fault. A．turn off                      B．pass off               C．smooth over        D．run over 答案：C设a，b为两条直线，α，β为两个平面，下列四个命题中，正确的命题是（ ）A．若a，b与α所成的角相等，则α∥bB．若a∥α，b∥β，α∥β，则a∥bC．若a?α，b?β，α∥b，则α∥βD．若a⊥α，b⊥β，α⊥β，是a⊥b