阅读理解。 It's so beautiful outside that spending the day in the office would be very boring. So why not take the vacations (假期) off? A new survey (调查) found that 31% of U.S workers don't always take all of their vacation days. Americans have 12 vacation days on average (平均) each year, but they give back an average of 3 vacation days each year. So why don't they use up their vacation days? Some say they would rather get money back for their unused days; some busy workers say they just can't leave their work. Americans have fewer vacation days than workers in any other country surveyed. The French take their vacations seriously. French workers get an average of 39 vacation days, and 40% plan to take at least one there-to-four-week vacation. Workers in Sweden receive an average of 25 vacation days a year, but they can't find time to use them all. More workers there return vacation days than any other country surveyed. British workers have the longest working week in Europe (欧洲), with 23 vacation days-the shortest vacation. So they feel overworked. 75% say their weekends or vacations are too short and 40% would sacrifice a day's pay (工资) for one more vacation day. 1. How many vacation days do Americans have on average each year in fact? A. 9 B. 12 C. 15 D. 23 2. Which country has the most workers working during the vacation days? A. America. B. France. C. Sweden. D. Great Britain. 3. What does the word 'sacrifice' mean in the last sentence? A. Use up. B. Put up. C. Take up. D. Give up. 4. Which of the following is true? A. Some American workers are too busy to leave their work. B. French workers can take one Three-to-four week days. C. Swedish workers can enjoy all of their vacation days. D. British workers have the shortest vacation days of all the countries surveyed.