A great deal of the knowledge we have about household goods【C1】______ largely from the adv

A great deal of the knowledge we have about household goods【C1】______ largely from the advertisements we read. Advertisements introduce us to new products or remind us of the existence of ones we already know about.【C2】______ you wanted to buy a washing machine, it is more likely that you would obtain details regarding performance, price, etc, from an advertisement. Lots of people【C3】______ that they never read advertisements, but this claim may be seriously doubted. It is【C4】______ possible not to read advertisements these days. And what fun they often are, too! Just think what a railway station or a newspaper【C5】______ be like without advertisements. Would you enjoy【C6】______ at a blank wall or reading railway bye-laws while waiting for a train？ Would you like to read only closely-printed columns of news in your daily paper？ A cheerful, witty advertisement makes such a【C7】______ to a drab wall or a newspaper full of the daily ration of calamities. We must not forget,【C8】______ , that advertising makes a positive contribution to our pockets. Newspapers, commercial radio and television companies could not survive without this【C9】______ of revenue. The fact that we pay so【C10】______ for our daily paper, or can enjoy so many broadcast programs is due entirely to the money spent by advertisers. Just think what a newspaper would cost if we had to pay its full price!

【C1】

A．obtains

B．requires

C．gains

D．derives

请帮忙给出正确答案和分析，谢谢！