下列选项不属于非正规教育的是（）

A.20世纪10、20年代

B.19世纪20、30年代

C.19世纪末20世纪初

D.20世纪20、30年代

A.全民教育

B.终身教育

C.民主教育

D.信息化教育

Read the following passage carefully and compose a “sentence outline” for it.

The Changing Workweek

In the early 1900s in the U.S.A., workers in large industries worked long days and long weeks. It was not uncommon for workers in the meat-packing companies of Chicago, for example, to work twelve to fourteen hours, for six or seven days a week. As unions started exerting their influence, however, the working conditions of American workers began improving, and the workweek was gradually shortened. Today, workers have workweek opinions that were unheard of earlier in the last century.

The five day workweek has become commonplace in American industries. However, he four-day workweek is becoming even more popular. Mary workers prefer four tea-hour days. This gives them longer working days, but it also gives them three-day weekends, an unheard-of luxury even twenty years ago. Management isn’t complaining since the same amount of work gets accomplished, and in some cases a plant can be totally shut down on the fifth day, saving the company thousands of dollars in utilities.

Another change in the workweek is the variable hours option. While American workers have traditionally worked either day or night shifts, some companies are allowing workers to set their own hours within the workweek. Flexible schedules are becoming more common in metropolitan areas with commuter-time traffic problems and in industries that are open around the clock. The advantage to the workers is that they can plan their hours around the days of their families. For example, a husband who takes each afternoon off could babysit the children while his wife works. The variable hours schedule also motivates workers because the company is letting them control their own time.

A third change in the workweek over the past twenty years is the use of overtime. While most workers do not have to work beyond a forty-hour week, many companies will pay them time and a half to do so. Although this is more expensive for the company, it is still cheaper than having to hire additional workers and providing benefits. On traditional nonworking days such as holidays, workers are often paid double-time or more to work. Overtime pay allows companies to meet their production needs without exploiting the workers. It allows workers to make extra money at a higher rate than they normally work for. Although overtime work often represents a return to longer working days and weeks, it is done on a voluntary basis and is usually negotiated willingly by the workers.

What does the future hold for American workers? As modern technology turns more and more wok to machines, the typical workweek may continue to shrink. Some companies have already gone to the thirty-five-hour week, and in the 21st century, the thirty-five-hour week may be standard. Within twenty years, the great advantage to shorter workweeks is that workers have more time off to themselves. However, given the financial demands upon American families in the future, it may also become common for workers to hold down two full-time jobs at one time. Given the American work ethic, most workers will probably fill their free time with more work instead of more leisure.