【正确答案】 C

【答案解析】[解析] as opposed to that of yesterday“与昨天的相对比”，that是代词，代替前面刚提到过的名词(特指)，相当于the+名词，以避免重复，此处的that代表前面的the speed of communications，如：My seat was next to that (=the seat) of the mayor.如果前面的名词是复数，后面就要用those代替，如：The objects of this group were nearly so drastic as those (=the objects) of the republicans.如果前面提到的是可数名词，后面再出现表示泛指意义的这个可数名词单数时，则可用泛指代词one代替；如果是特指，则可用the ones代替，如：I haven"t a pen. Can you lend me one? The big fish devours the little ones.