Question 20 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. 

20. What do critics think of Mexican Oil Company’s bonus policy?

解析：D。录音中提到，批评人士认为，公司的奖金政策与许多健康专家的建议相矛盾，人们很难控制自己的体重，这就使得这项奖金政策不公平，D项Unfair原词复现，故为正确答案。

错项排除：A项Impractical和C项Unmanageable在录音中都无依据，故均排除。B项利用录音中的inconsistent设置干扰，但录音中是说，一些专家认为该政策与我们所知道的体重调节科学不一致的（inconsistent），并不是批评人士的观点，B项张冠李戴，故错误。