【短文内容】
An old saying has it that half of all advertising budgets are wasted-the trouble is, no one knows which half . In the internet age, at least in theory ,this fraction can be much reduced . By watching what people search for, click on and say online, companies can aim “behavioural” ads at those most likely ...
我的答案是：26.lower their operational costs27.online advertisers28.will not benefit consumers29.DNT may not serve its intended purpose30.skepticism
主要需要说明的是27...
