46. What do we learn about advertising campaigns from the snack food companies?
- A. They convey the idea that their products are ok if consumers exercise more.
- B. They send the message that bad diets are responsible for Americans' obesity.
- C. They usually feature sports stars to emphasize the benefits of their snack foods.
- D. They claim that lack of exercise is to blame for the increasing obesity rates.
答案：A
答案句：Advertising campaigns from the snack food companies, often featuring sports stars, send the message that we can neutralize any negative effects of consuming their products simply by getting more physical exercise.
参考译文：零食公司的广告宣传活动，通常以体育明星为主角，传递的信息是：只要增加体育锻炼，我们就能抵消食用其产品的任何负面影响。
定位线索：题干“advertising campaigns from the snack food companies”→答案句“Advertising campaigns from the snack food companies”；文中“neutralize any negative effects...by getting more physical exercise”对应选项A“their products are ok if consumers exercise more”。
解析：题干问零食公司广告宣传传递了什么信息。答案句明确指出广告传递的信息是：通过更多体育锻炼可以抵消食用产品的负面影响，即选项A“如果消费者多锻炼，产品就没问题”。选项B和D均将责任归咎于饮食或缺乏锻炼，与原文“send the message that we can neutralize...”不符；选项C虽提到体育明星，但未强调“benefits”，且不是广告传递的核心信息。
47. What does the passage say about health education?
- A. It has shed light on teens' instinct for rebellion and autonomy.
- B. It has placed much more emphasis on cure than on prevention.
- C. It has contributed little to the campaigns against obesity.
- D. It has largely failed to turn teens away from junk food.
答案：D
答案句：Unfortunately, while health education has shown some success among young children, teens have been harder to reach.
参考译文：不幸的是，虽然健康教育在幼儿中取得了一些成功，但青少年更难触及。
定位线索：题干“health education”→答案句“health education”；文中“teens have been harder to reach”对应选项D“largely failed to turn teens away from junk food”。
解析：题干问文章关于健康教育说了什么。答案句指出健康教育对幼儿有一定成功，但对青少年“harder to reach”，即难以影响他们远离垃圾食品，对应选项D。选项A“shed light on teens' instinct”是后文新干预的内容，非健康教育；选项B“emphasis on cure”与原文“Prevention is better than cure”矛盾；选项C“contributed little to the campaigns”范围过大，原文仅说对青少年效果有限。