or your sodium intake is high, you should reduce sodium consumption, perhaps even to below 5, 000 milligrams.

28. For healthy elderly people, the US government recommends sodium intake_______.

　A. 1,500 milligrams daily

　B. 2,300 milligrams daily

　C. 3,000 milligrams daily

　D. 3,400 milligrams daily

29. According to the study, consuming less than 3,000 milligrams of sodium a day _______.

　A. is beneficial for most patients

　B. may help prevent heart disease

　C. may be harmful to your health

　D. is especially helpful for Americans

30. What is Strom's attitude towards the research findings?

　A. He is doubtful about them.

　B. He is uncertain of them.

　C. He tolerates them.

　D. He supports them.

31. What is the Canadian scientists' advice for high blood pressure patients?

　A. Follow the government's dietary guidelines.

　B. Lower sodium intake to a reasonable level.

　C. Join one of the leading medical groups.

　D. Have physical examinations regularly.

　　　D

　　Across Britain, burnt toast will be served to mothers in bed this morning as older sons and daughters rush to deliver their supermarket bunches of flowers. But, according to a new study, we should be placing a higher value on motherhood all year.

　　Mothers have long known that their home workload was just as heavy as paid work. Now, the new study has shown that if they were paid for their parental labours, they would earn as much as $ 172,000 a year.

　　The study looked at the range of jobs mothers do, as well as the hours they are working, to determine the figure. This would make their yearly income $ 30,000 more than the Prime Minister earns.

　　By analysing the numbers, it found the average mother works 119 hours a week, 40 of which would usually be paid at a standard rate and 79 hours as overtime. After questioning 1,000 mothers with children under 18, it found that, on most days, mums started their routine work at 7am and finished at around 11pm.

　　To calculate just how much mothers would earn from that labour, it suggested some of the roles that mums could take on, including housekeeper, part-time lawyer, personal trainer and entertainer. Being a part-time lawyer, at £ 48.98 an hour, would prove to be the most profitable of the "mum jobs", with psychologist (心理学家) a close second.

　　It also asked mothers about the challenges they face, with 80 percent making emotional demand as the hardest thing about motherhood.

　　Over a third of mums felt they needed more training and around half said they missed going out with friends.

　　The study shows mothers matter all year long and not just on Mother's Day. The emotional, physical and mental energy mothers devote to their, children can be never-ending, but children are also sources of great joy and happiness. Investing (投入) in time for parenting and raising relationships is money well spent.

32. How much would a mother earn a year if working as the Prime Minister?

　A. £ 30,000. B. £ 142,000. C. £ 172,000. D. £ 202,000.

33. The biggest challenge for most mothers is from .

　A. emotional demand B. low pay for work C. heavy workload D. lack of training

34. What is stressed in the last paragraph?

　A. Mothers' importance shows in family all year long.

　B. The sacrifices mothers make are huge but worthwhile.

　C. Mothers' devotion to children can hardly be calculated.

　D. Investing time in parenting would bring a financial return.

35. What can we conclude from the study?

　A. Mothers' working hours should be largely reduced.

　B. Mothers should balance their time for work and rest.

　C. Mothers' labour is of a higher value than it is realized.

　D. Mothers should be freed from housework for social life.