阅读下列材料，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。
A
This is not a problem in Munich even if it is already the afternoon. The last light of the day can always be enjoyed. Here are four hiking tours for late risers and after-work athletes. Let's get out into nature quickly.
The Sundown Tour
With a bit of luck, after 5 p. m. you will have the whole view to yourself. Lake Walchensee lies below, opposite is the Herzogstand mountain, with the red sun setting below it. If you are walking down the mountain in the dark, however, you should always have headlamps with you, otherwise it will become too dangerous.
The Quick Tour
Sometimes the god stuff is so much closer than you think, on the Neureuth mountain, for example. The tour from the railway station in Tegermsee up to the mountain is comparably short and therefore suitable for all walkers who just want to stretch their legs after work has finished.
The Railway Tour
The greatest advantage of the Laber for late-in-the-day leisure walkers lies, however, in the mountain railway: its last trip down the mountain doesn't leave until between 4:30 p.m. and 5 p.m. So you do not need to worry whether you still have enough time for the relaxing return journey.
The Cycling Tour
Who says that people who like to take exercise later on in the day always have to walk? Even many Munich residents forget that, in addition to the river Isar, there is a river in the city which is just as beautiful. If you want to explore the river and the associated Wurmtal valley, rent a bike and follow the shore from Pasing over Grafelfing and Gauting as far as Starnberg.
21. Which tour best suits a tourist who prefers doing light exercise?
A. The Sundown Tour. B. The Quick Tour.
C. The Railway Tour. D. The Cycling Tour.
22. What is needed to take the Cycling Tour?
A. A headlamp. B. A guide. C. A mountain bike. D. A railway ticket.
23. What do the four tours have in common?
A. Providing safety experience. B. Demanding a low budget.
C. Covering rivers and valleys. D. Suiting after-work tourists.
