. He is not ________ a fool ________.

A．such, as he is looked

B．such, as he looks

C．as, as he is looked

D．so, as he looks

当采用一级分光方式，光分路器可设在主干层，这种方式适合于用户非常分散的情况及（）

A、多层公寓楼

B、小高层公寓楼

C、高档别墅区

D、新建的用户光缆网