Question 21 is based on the passage you have just heard.

听力原文

        (19) [Workers at Mexican Oil Company will receive a health incentive of almost $300 a year if they meet certain body weight standards. To qualify for the bonus, they must maintain a healthy weight.] For those who are overweight or obese, they can receive the bonus if they reduce their weight by 10% during the year. 

        Some applaud the policy as fair, because it rewards both individuals who maintain a healthy weight and those who are working towards achieving it. (20) [But critics say the policy contradicts recommendations by many health experts who warned that a person’s weight is influenced by genetic and environmental factors. That means weight can be hard for individuals to control, which makes the bonus unfair.] 

        Some experts say the policy is inconsistent with the science of what we know about body weight regulation. These experts argue that focusing on weight is the wrong approach. (21) [A more productive method of encouraging health among employees is to promote healthy behaviors.] For example, companies can give workers gym memberships, or encourage participation in lectures on healthy eating and living. They can also reduce sweets and provide healthier snacks in the office and healthier meals at the company canteen. Or they can give employees more time during their lunch break to exercise. These are much better and much more productive ways for companies to move forward on their employees’ well-being. 

21. What do experts propose companies do about workers’ well-being? 

解析：C。录音中提到，专家认为，关注体重这个方法不对。促进员工健康的一种更有效的方法是促进健康的行为（healthy behaviors）。C项与此内容相符，其中的Encourage是promote的同义替换，healthy behaviors为原词复现，故C项为正确答案。

错项排除：录音中提到，专家认为奖金政策是不对的，A项提供更多的补贴与此内容相悖，故排除。B项的working environment在录音中无依据，故排除。D项利用录音中出现的lunch和snacks进行拼凑，但录音中是说可以提供更健康的零食（healthier snacks），在午休时间（lunch break）提供更多的时间进行锻炼，故D项错误。