单选题
National Parks have more and more visitors each
year. In the last ten years the number of campers using the camp sites has more
than doubled. Camping as a family vacation has suddenly become extremely
popular in America. It is a cheap way to travel; its simple pleasures are a
pleasant change from hectic urban life; and it can be enjoyed by children of all
ages. In car trunks or in racks on top of cars, families load a
tent, sleeping bags, inflatable mattresses, cooking pans and eating utensils,
and an ice chest for storing food. When they arrive at a camping ground they
find a cleared space in which to pitch their tent, a fireplace for cooking, and
usually a picnic table and benches--water and firewood nearby. By evening they
are settled under the stars, the campsite around them dotted with lights from
cooking fires and lanterns hung from trees. Vacations are not
all in resorts or in the wilderness. Swarms of vacationing Americans visit New
York and Washington each year. They visit New York because there is no place in
the world like this tremendous, exciting city, the busiest port in the world,
with its great steel and glass skyscrapers, its theaters and shops, its beauty
of skyline and shoreline, and its thrilling five-cent ferry ride past the Statue
of Liberty. They visit Washington because it is the nation's capital, where they
can see their government at work, tour the public rooms of their President's
home, the White House, and walk along the wide avenues to the art galleries and
museums. Here they can see exhibits of the native peoples of their land--the
Indians and the Eskimos. They can look at Lindbergh's small, fragile plane in
which he crossed the Atlantic Ocean. They can ride the elevator to the top of
the Washington Monument, visit Washington's Mount Vernon home, and feel the
shiver of national pride as they stand at the foot of the great Lincoln Monument
and read the stirring words of his Gettysburg Address. For
Americans vacation time ends on Labor Day--the first Monday in September. Labor
Day is the day when summer cottages are closed, when families head back to their
homes. The highways are jammed with cars. The cars are jammed with families and
belongings and treasures of the summer. By the time the drivers are back home
they sometimes feel that what they need is a vacation.
单选题
Which of the following is not a reason for which camping has suddenly
become extremely popular in America?