【答案解析】原文：Homework is an important part of schooling, but the purposes of giving children homework will change as they grow older. At the primary level, the main aim is to cultivate good habits, like learning to plan and exercising self-discipline. During the secondary school years, extending what is learned at school is positively related to academic achievement, so the content of homework becomes more important.So how can you help your child do their best?Creating an ideal working environment will make it easier for them to get down to their assignments quickly. Make sure it’s free of distractions, and—for primary school children at least—somewhere near you, so you can answer questions and offer encouragement.You probably have to help younger children plan their session, but it’s important that by the end of primary school it’s second nature.Get them to tell you everything they have to do. Then encourage them to establish an order in which they do work.When there are several different assignments, make sure they begin with one they enjoy, so it seems easy to get started. It’s best to take on the most difficult task second—once they’re settled, but before they get tired.If older children have more than an hour of homework, encourage them to schedule a short break to stretch.If you encourage them to tell you what they’ve learned, they’ll absorb the information more deeply and remember it more readily.Questions 16 to 18 are based on the passage you have just heard.16. What is the main aim of homework for primary school kids?17. What does the passage suggest parents do to help their children?18. What should children do to deal with multiple assignments?事实细节题。短文开头指出，墨西哥石油公司的员工如果达到一定的体重标准，每年将获得近300美元的健康奖励。为了获得奖金，他们必须保持健康的体重。由此可知，体重达到一定标准的员工即可获得奖金，故答案为A)。
【正确答案】
D
【答案解析】原文：Homework is an important part of schooling, but the purposes of giving children homework will change as they grow older. At the primary level, the main aim is to cultivate good habits, like learning to plan and exercising self-discipline. During the secondary school years, extending what is learned at school is positively related to academic achievement, so the content of homework becomes more important.So how can you help your child do their best?Creating an ideal working environment will make it easier for them to get down to their assignments quickly. Make sure it’s free of distractions, and—for primary school children at least—somewhere near you, so you can answer questions and offer encouragement.You probably have to help younger children plan their session, but it’s important that by the end of primary school it’s second nature.Get them to tell you everything they have to do. Then encourage them to establish an order in which they do work.When there are several different assignments, make sure they begin with one they enjoy, so it seems easy to get started. It’s best to take on the most difficult task second—once they’re settled, but before they get tired.If older children have more than an hour of homework, encourage them to schedule a short break to stretch.If you encourage them to tell you what they’ve learned, they’ll absorb the information more deeply and remember it more readily.Questions 16 to 18 are based on the passage you have just heard.16. What is the main aim of homework for primary school kids?17. What does the passage suggest parents do to help their children?18. What should children do to deal with multiple assignments?事实细节题。短文中提到，评论家们认为，墨西哥石油公司的奖励政策违背了健康专家们的建议。这些专家们警告说一个人的体重受到基因和环境因素影响，这意味着个人很难控制自己的体重，这使得这一奖励政策有失公平。因此，答案为D)。
【正确答案】
C
【答案解析】原文：Homework is an important part of schooling, but the purposes of giving children homework will change as they grow older. At the primary level, the main aim is to cultivate good habits, like learning to plan and exercising self-discipline. During the secondary school years, extending what is learned at school is positively related to academic achievement, so the content of homework becomes more important.So how can you help your child do their best?Creating an ideal working environment will make it easier for them to get down to their assignments quickly. Make sure it’s free of distractions, and—for primary school children at least—somewhere near you, so you can answer questions and offer encouragement.You probably have to help younger children plan their session, but it’s important that by the end of primary school it’s second nature.Get them to tell you everything they have to do. Then encourage them to establish an order in which they do work.When there are several different assignments, make sure they begin with one they enjoy, so it seems easy to get started. It’s best to take on the most difficult task second—once they’re settled, but before they get tired.If older children have more than an hour of homework, encourage them to schedule a short break to stretch.If you encourage them to tell you what they’ve learned, they’ll absorb the information more deeply and remember it more readily.Questions 16 to 18 are based on the passage you have just heard.16. What is the main aim of homework for primary school kids?17. What does the passage suggest parents do to help their children?18. What should children do to deal with multiple assignments?事实细节题。短文中提到，专家们认为，关注工资对于改善健康来说是一个错误的策略，鼓励员工关注健康更有效的方法是提倡健康的行为。因此，答案为C)。