13．Discoveries at the famous Sanxingdui ruins in Southwest China show that the region's ancient Shu Kingdom Civilization shared similarities with the Maya.
The Sanxingdui ruins belonged to the Shu Kingdom that existed at least 4，800 years ago and lasted more than 2，000 years，while the Mayan civilization built its city-states around 200 AD．
The bronze-made remains of trees unearthed at the ruins of the Shu Kingdom resemble the sacred ceiba tree，which symbolized the union of heaven，earth and the underworld in the Mayan civilization. "They are very important similarities，" says Santos，a Mexican archaeologist （考古學(xué)家） stressing that "the representations of trees in both cultures provide a symbolism that is very similar".
The findings at the Sanxingdui ruins，considered one of the greatest archaeological discoveries of the 20th century，also show a new aspect of Bronze Age culture，indicating the ancient civilization already had technologies that were thought to have been developed much later.
While the time span between the Shu kingdom and the Mayan culture is great，the findings highlight the closeness between the two civilizations.They developed in areas with comparable climates and reflected their worldview through related symbols. "In the end，man is still man，independent of time and space.What we have is that，at this latitude （緯度），both the Shu people and the Mayans looked at the same sky and had the same stars on the horizon，"the expert says.
One notable feature of the recent discoveries at Sanxingdui was the cross-subject work and technology applied by teams of Chinese archaeologists，which allowed the unearthing of artifacts as fragile as silk remains，which other types of less careful digging methods would not have been able to register.
Cooperation between Chinese and Mexican archaeologists could benefit projects in the Mayan world，where the rainy climate and humidity are problematic for the conservation of ruins.
"Every time our cultural knowledge increases，regardless of whether we speak one language or another，what it shows us is that we continue to be sister cultures and，therefore，the exchange of such knowledge is fundamental，" says Santos.
（1）What is a similarity between the Shu Kingdom and Maya civilization？
A．Their starting time.
B．Their historical origins.
C．Their cultural symbols.
D．Their ceremony traditions.
（2）The findings at the Sanxingdui ruins have proved that
.
A．silk was a common clothing material then
B．some technologies were developed much earlier
C．the Bronze Age started earlier than previously assumed
D．the Shu Kingdom and the Mayan world had close contact
（3）What is a common challenge for the conservation of both ruins？
A．Damp weather.
B．Positioning of ruins.
C．High latitude.
D．Language barriers.
（4）What is the focus of Santos quote in the last paragraph？
A．Our cultural knowledge is increasing.
B．The benefits of speaking a different language.
C．The increasing sisterhood in culture between China and Mexico.
D．The importance of the exchange of cultural knowledge.
