Tom kept quiet about the accident ______ lose his job.

A．so not as to

B．so as not to

C．so as to not

D．not so as to

下列关于牙槽骨生物学特性的叙述，不正确的是（）

A.可由于不断新生而影响牙齿发育

B.受到外界的压力，可表现为吸收

C.具有高度的可塑性

D.随牙齿的萌出而不断改建

E.较牙骨质更容易吸收