B．show how valuable the product is

　　C．test the market value of the product

　　D．make them as interesting as TV movies

　　解析：选A　推理判断题。根据第二段第一句可知，商业广告所做的一切努力都是为了促使人们去买商品。

　　3．From the rules set for making commercial ads, we can see that ________.

　　A．the middle­class buyer likes to work with his hands

　　B．the more stupid the characters, the more buyers of the product

　　C．ad designers attract different people with different skills

　　D．an upper­class buyer is more interested in houses and furniture than a middle­class buyer

　　解析：选C　推理判断题。由第三段内容可知，为了吸引不同购买力的顾客，商业广告设计者使用不同的手段来宣传产品。

　　4．It is believed by the writer that ________.

　　A．few people like to watch TV commercials

　　B．TV commercials are a good guide to buyers

　　C．TV commercials often make people laugh

　　D．people do not think highly of TV commercials

　　解析：选D　推理判断题。由文章最后一段中"We don't think we pay that much attention to them.But evidence shows we are kidding ourselves."推断可知答案。

　　B

　　Do you dare to sleep on the wild side? Join us for Bunk with the Beasts overnight adventures. These overnights are held on zoo grounds, with sleeping accommodation inside, at the Gates Education Center.

　　Each Bunk with the Beasts overnight adventure is specifically designed with activities that are related to the theme of the Bunk you have chosen. Your group will explore exhibits, learn fun facts, and take part in learning games or stories that are related to your Bunk topic. The Denver Zoo covers 80 acres, and is home to more than 4,000 animals, representing over 750 different species. You will not see everything in just one visit, but you can dive deeper into the topic at hand. Participants (参与者) are free to explore the zoo on your own after the Bunk ends, if you would like to see some of the exhibits and animals not related to your chosen topic.

The overnight adventures offer a more personalized exploration of the zoo. Each adventure includes different activities specific to the theme, but you can count on an active, fun­filled experience that includes：