阅读下列短文，从每题所给的四个选项(A、B、C、和D)中，选出最佳选项。
A
Four Underwater Cities You Must Visit
Dwarka-India
Dwarka is located 70 feet under the sea near the inhabited island of Bet Dwarka. It was built sometime between 9, 000 and 12, 000 years ago and those fortunate enough to visit can witness a diverse variety of buildings in addition to a seaport and protective walls made of sandstone. Furthermore, large stone anchors indicate that overseas trade took place in Dwarka during the Age of Antiquity all the way through medieval times.
Pavlopetri-Greece
Pavlopetri was founded around 5, 000 years ago, making it one of the oldest underwater lost cities in the world. Since it was rediscovered in 1967, archeologists and tourists alike have been fascinated by the well-preserved handicrafts. What makes Pavlopetri stick out is that it has a nearly-complete town plan, including at least 15 buildings. There is also evidence that it was once a major producer of textiles, with some of the equipment still complete!
Antirhodos-Egypt
This ancient underwater island was rediscovered in 1996 near the Alexandria harbor. In addition to being the site of the Lighthouse of Alexandria, one of the Ancient Wonders of the World that had been presumed(推测)lost forever, explorers can find a marble-floored 3rd century B. C. palace. The best thing is that the island is only a few meters under the water, which makes it easy to explore even for new divers!
Atlit-Yam-Israel
This underwater site was discovered in 1984 off the coast of Atlit near Haifa, and is estimated to have been settled between 6, 900 and 6, 300 B. C. This location offers the clearest evidence of where humans made the transition(过渡)from hunter-gatherers to settled farmers. Dive insurance is required, so make sure you are covered when you plan your trip.
21. What can we learn about Dwarka?
A. It has a historical palace. B. It has various ancient buildings.
C. It has a completely preserved town. D. It has the clearest evidence of hunters gathered.
22. Which place is easily accessible to divers?
A. Dwarka. B. Pavlopetri. C. Antirhodos. D. Atlit-Yam.
23. What do visitors need to do before visiting Atlit-Yam?
A. Book the trip online. B. Buy dive insurance.
C. Take a map and a compass. D. Learn about the history of fanning.
