Many lifestyle patterns do such           great harm to health that they actually speed up

         weakening of the human body.

A．a; /

B．/; the

C．a; the

D．/;/

有关鼻窦的叙述，错误的是（）

A.鼻窦是颅骨不规则骨内的气腔

B.上颌窦为一对最大的鼻窦

C.上颌窦底朝鼻腔

D.上颌窦的顶壁即眶底

E.筛窦在额骨内