单项选择题

A green revolution has been taking place in the countryside. But so quietly has it been can-ied out, and with so little fuss, that many people are unaware of what has been achieved. Don’t expect to find anything so wild or so big as a national park, or anything as small and tame as your local recreation room. Country parks come somewhere between the two, with the accent on leisure rather than conservation.
Ten years ago the country park was nothing more than an idea floated in a Government White Paper called Leisure in the Countryside. Today there are well over 100 country parks flourishing in nearly every comer of England and Wales, and more parks are in the pipeline.
They were designed to serve three basic purposes: to make it easier for town dwellers, to enjoy the open air without traveling too far and adding to traffic congestion, to ease the pressure on the more remote and solitary places; and above all, perhaps, in the words of the White Paper, to reduce the risk of damage to the countryside—aesthetic, as well as physical—which often comes about when people simply settle down for an hour or a day where it suits them. somewhere "in the country"—to the inconvenience and indeed the expense of the countryman who lives there.
A good country park will certainly be readily accessible for cars and pedestrians and you may be able to reach it by public transport, it will cover at least 25 acres and may contain woods, open parkland or a stretch of water. It may even be on the coast.
Some country parks provide refreshment facilities, picnic sites, information centers and a warden service. All of them have car parks and toilets. There may be an admission fee or a charge for parking your car, and a few parks close during the winter, so it is best to check before setting out. The great thing about country parks is that they are prepared for people. So you feel really welcome in the countryside.
In some parks you can swim, sail, fish, row or go horse riding. Others offer quieter pleasures: nature trails, gardens, ancient monuments, fine views.
The commonest type of park is the traditional parkland of some bygone ancestral estate, sometimes with the great house or castle still intact within the grounds, as at Elvaston Castle, near Derby. By there is no truly typical country park. In landscape terms their range is immense: downs, cliffs, woods, moors. Heaths, even reclaimed mineral workings, old gravel pits and abandoned railway lines have been transformed with the aid of cash handouts from the Countryside Commission.
It is implied in the passage that ______.