A、About 12 hours. B、About 13 hours. C、About 17 hours. D、About 21 hours. D选项表明，本题考查时间，听音时应留意与时间相关的信息，并听清问题问的是什么。短文中提到，结了婚的女人在六七十岁

Having a husband means an extra seven hours of housework each week for women, according to a new study. For men, getting married saves an hour of housework a week. "It’s a well-known pattern," said lead researcher Frank Stafford at University of Michigan’s Institute for Social Research. Men usually work more outside the home, while women take on more of the housework. He points out that differences among households exist. But in general, marriage means more housework for women and less for men. And the situation gets worse for women when they have children. Overall, times are changing in the American home. In 1976, women busied themselves with 26 weekly hours of sweeping-and-dusting work, compared with 17 hours in 2005. Men are taking on more housework, more than doubling their housework hours from 6 in 1976 to 13 in 2005. Single women in their 20s and 30s did the least housework, about 12 weekly hours; while married women in their 60s and 70s did the most — about 21 hours a week. Men showed a somewhat different pattern, with older men picking up the broom more often than younger men. Single men worked the hardest around the house, more than that of all other age groups of married men. Having children increases housework even further. With more than three children, for example, wives took on more of the extra work, clocking about 28 hours a week compared with husbands’ 10 hours.
Questions 32 to 35 are based on the passage you have just heard.
32. What is the passage mainly about?
33. What can we learn from Stafford’s research?
34. How many hours did married women in their 60s and 70s spend on housework one week?
35. Which group of men does most housework according to the passage?