[单项选择]One of the reasons that some people are not willing to quit even in their eighties and nineties is that________.
A. they are in the need of financial security
B. they would rather work than be disturbed by domestic discord
C. they long for a sense of identity and being accomplished
D. they may have health problems from sheer boredom

People travel for a lot of reasons. Some-tourists go to see battlefields of religious shrines. Others are looking for culture, or simply want to have their pictures taken in front of famous places, but most European tourists are looking for a sunny beach to lie on.
Northern Europeans are willing to pay a lot of money and put up with a lot of inconveniences for the sun because they have so little of it. Residents of cities like London, Copenhagen, and Amsterdam spend a lot of their winter in the dark because the days are so short, and much of the rest of the year is in the rain. This is the reason why the Mediterranean has always attracted them. Every summer, more than 25 million people travel to Mediterranean resorts and beaches for their vacation. They all come for the same reason, sun!
The huge crowds mean lots of money for the economies of Mediterranean countries. Italy’s 30,000 hotels are booked solid every summer. And 13 million people camp out on Frenc
A. all the 37 million people living in Spain are tourists
B. every Spanish is visited by a tourist every year
C. every person living in Spain has to take care of a tourist
D. every year almost as many tourists visit Spain as there are people living in that country

Most young people enjoy some forms of physical activity. It may be walking, bicycling, or swimming, or in winter, skating or skiing. It may be a game of some (36) -- football, hockey, golf or tennis. It may be mountaineering.
Those who have a passion for (37) high and difficult mountains are often (38) with astonishment. Why are men and women willing to (39) cold and hardship, and to take risks on high mountains This astonishment is caused, (40) , by the difference between mountaineering and other forms of activity to (41) men give their leisure. Mountaineering is a sport and (42) a game. There are no man-made roles, (43) there are for such games as golf and football. There are, (44) rules of a different kind which it would be dangerous to (45) , but it is this freedom from man-made rules that makes mountaineering (46) to many people. Those who climb mountains are (47) to use their own met
A. familiar
B. regular
C. similar
D. thirty