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
Have you ever been into a cave? If not, please follow us and explore some of the most beautiful caves from around the world!
Marble Caves
Located in the center of Lake General Carrera, the Marble Caves in Chico, Chile, are only accessible by boat. The surrounding crystal clear waters allow visitors to see the rock formations beneath them while the rock ceilings above change color(depending on the writer levels and the season). The best time to visit: during sunrise and sunset, when the sun’s rays light up the cave walls, making it an experience to remember.
Reed Flute Cave
Reed F1ute Cave known as “the Palace of Natural Arts” is located in the northwest of Guilin in southern China.The limestone cave offers a grand fairyland of stalactites(钟乳石), stone pillars, stone curtains, birds, plants and animals in fantastic shapes and colors.
Fingal’s Cave
This incredible sea cave is located on the uninhabited island of Staffa in Scotland. The cave’s size, shape, and naturally—arched(拱形的) roof combine with the waves to create strange sounds that enhance its cathedral—like atmosphere.
The Blue Grotto
The Blue Grotto is the symbol of Capri. It is a sea cave found on the coast of the island and is a well-known spot to all who visit the area. This cave is unique for its brilliant blue light which comes from two sources: the entrance to the cave and a bigger hole beneath the entrance. When viewed from inside the cave, the entrance appears as a brilliant white light just above the waterline, while the underwater hole, which is the larger source of light, provides a blue light.
21. Why is sunset the best time to visit Marble Caves?
A. Because it has enough light in it.
B Because it has the most beautiful scenery.
C. Because it is surrounded by clear waters.
D. Because boats are only available at sunset.
22. Which cave will you go to if you want to enjoy the strange sound?
A. Reed F1ute Cave. B. Marble Caves.
C. The Blue Grotto. D. Fingal’s Cave.
23. What is special about the Blue Grotto?
A. C1ear waters. B. Various birds and animals.
C Bright blue light. D. Strange shapes.
