1.Oxford,as we know ---- is one of the best universities in

1.Oxford,as we know ____ is one of the best universities in the world.A.that B./ C.it D.this2.They are ____the same size ,so you may take ____half of the cake.A.at;each B.in;both C.at;neither D.of;either第一道选的是B第二道是D,请高手从语法的角度给讲解一下,不甚感激.