【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可用泛指代词one代替，如果是特指可用the ones代替，如：I haven’t a pen．Can you lend me one? The big fish devours the little ones。