The Great Wall，China
   Stretching over 21，000 kilometers，the Great Wall was built to prevent invasions and has a history of more than 2，000 years.UNESCO in February 2019 calls it an absolute masterpiece，not only because of the ambitious character of the undertaking but also the perfection of its construction.But perfection isn't protection.51.2 percent of the Great Wall either has had already disappeared or is at a significant risk of disappearing.Besides for wind and rain erosion，the main reasons for the destruction of the Great Wall are human factors such as tourism，construction，human contact and so on.
   Pamukkale，Turkey
   Pamukkale，which means "cotton castle" in Turkish，is famous for its shining white calcite terraces with warm and mineralrich waters flowing.
   Before being listed as a World Heritage Site in 1988，Pamukkale had been severely damaged by human activities.People used hot spring water to fill swimming pools，some visitors stood on the rocks and some even bathed in the hot springs with soap and shampoo.To protect the terraces，the Turkish government has decided to pull down the hotels and require all tourists to visit this site barefoot.
   Great Barrier Reef，Australia
   Home to 400 types of coral and 1，500 species of fish，the Great Barrier Reef draws visitors to Australia from all over the world.
   However，the Great Barrier Reef is expected to suffer from increasingly frequent bleaching events，cases in which corals turn white and may die，according to a UNESCO report.The heat waves caused by global warming have killed half of the coral here in the two years，according to a CNN report.Pollution from industry developments and harmful fishing practices are also big concerns.
   The Dead Sea，Jordan
   At 423 meters below sea level，the Dead Sea is 10 times saltier than the ocean，meaning that the water is so dense，even tourists who can't swim will be able to float.
   But the seaside resorts built in the 1980s now sit kilometers away from the water's edge，which has lost half of its surface area in the past 40 years.The damage is irreversible due to the nature of the mineral industry and the type of agricultural use that has drained the water.

（1）Which are you required to visit without shoes？

B

B

A．The Great Wall，China.
B．Pamukkale，Turkey.
C．Great Barrier Reef，Australia.
D．The Dead Sea，Jordan.
（2）Which of the following statements is TRUE？

C

C

A．Main reasons for the destruction of the Great Wall come from wind and rain erosion.
B．Pamukkale was damaged by human activities after 1988.
C．Pollution and heat waves caused by global warming kill much coral in the Great Barrier Reef.
D．Half of the Dead Sea surface area has disappeared in the past two decades.
（3）What do the above spots have in common？

D

D

A．They are all famous endangered natural spots.
B．They're damaged only by human activities.
C．They all draw the attention of the governments.
D．They're all seriously damaged.