阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
Ideas for Unusual Holidays in Europe
Today's modern travellers are journeying further and more responsibly to unusual holiday destinations. Here are 4 ideas for an unusual holiday in Europe.
Go diving in Spain
Participate in a plastic cleanup project based in Barcelona, helping to empty the ocean of waste. Experienced and new divers can both take part, and it's a brilliant schedule of volunteer work in the mornings and free time the rest of the day.
Discover a new approach to life in Vipava
The Vipava Valley region is somewhere you can experience a unique way of life perfectly in harmony with the natural environment. Everywhere you go, you will find a peaceful attitude to life.
Step into a fairytale in Freudenberg
What makes this place so special is the streets of 17th century halfwooden houses in Freudenberg's old town. Along with superb cuisine and fantastic natural scenery, the area has hiking and cycling trails.
Look after dogs and cats in Rotterdam
This animal volunteer project in Rotterdam gives you the opportunity to play with dogs and cats. Rotterdam is a unique part of the Netherlands in that it is full of urban architecture and a varied nightlife scene that makes it an ideal location for a city break.
21．What can visitors do when diving in Spain?
A．Collect waste from the water. B．Get professional guidance.
C．Explore the depths of ocean. D．Improve their diving skills.
22．What attracts visitors most in Freudenberg?
A．Superb cuisine. B．Natural landscape.
C．Streets of halfwooden houses. D．Hiking and cycling trails.
23．Where should visitors go if they are interested in architecture?
A．Barcelona. B．Vipava. C．Freudenberg. D．Rotterdam.
