Question 23 is based on the passage you have just heard.

听力原文

    An average person consumes 144 pints of milk a year, but 40% of that is poured onto cereal, and 60% of those people are children. But what was once advertised as nutritious is becoming unpopular. (22) [Americans drink 37% less milk than they did in the 1970s.] And in the UK, dairy consumption overall has fallen by a third in the past 20 years. (23) [Milk is increasingly being described in a negative light. A recent blog suggested: “Maybe people are drinking less milk because it is poisonous to many of us.”] Lactose is the sugar found in milk and dairy products. (24) [It needs a series of complex proteins to break it down. Without enough of these proteins, the lactose is broken down by bacteria in the human body. This can cause physical pain and produce gas in the stomach.] However, after we have finished breast or formula feeding, most of us don’t continue producing the complex proteins in our body, which are necessary to break down the lactose. Despite the problems in digesting milk, it does provide many benefits. (25) [Milk is nutritious. It contains vitamins A and D, as well as protein and isn’t full of calories.] You can test yourself by drinking a large glass of milk. If you get sick in your stomach within the next 24 hours, you are lacking the proteins to digest milk.

23. How do Americans and British people think of milk nowadays?（美国人和英国人如今对牛奶的看法是什么？）

解析：A。录音中说到，英国人和美国人喝的牛奶减少，人们越来越多地从负面的角度来形容牛奶。最近的一篇博客指出，也许人们喝牛奶变少的原因是牛奶会对我们很多人的身体造成损害。A项It is not as healthy as once thought是对此内容的概括总结，为正确答案。

错项排除：录音中没有提到牛奶保鲜和牛奶对老年人的益处等相关信息，排除B项和C项。录音中提到，牛奶热量不高，也就是说牛奶并不易使人发胖，D项错误。