[单项选择]Maya cities were the administrative and ritual centres for regions which included the city itself and an agricultural hinterland.
The largest Maya cities were home to many people. At the major centre of Tikal, for example, within a six-square-mile area, there were over 10,000 individual structures ranging from temple-pyramids to thatched-roof huts. Tikal’s population is estimated at up to 60,000, giving it a population density several times greater than an average city in Europe or America at the same period in history.
A Maya city from the Classic Period usually consisted of a series of stepped platforms topped by masonry structures, ranging from great temple-pyramids and palaces to individual house mounds. These structures were in turn arranged around broad plazas or courtyards. Maya architecture is characterized by a sophisticated sense of decoration and art, expressed in bas-relief carvings and wall paintings. At major sites like Tikal, large buildings and complexes
A. rulers and elite lived in palaces
B. monks or priests might have lived in palaces
C. rulers’ palaces were torn down later
D. there was no religious orders in ancient Maya

[单项选择]Maya cities were the administrative and ritual centres for regions which included the city itself and an agricultural hinterland.
The largest Maya cities were home to many people. At the major centre of Tikal, for example, within a six-square-mile area, there were over 10,000 individual structures ranging from temple-pyramids to thatched-roof huts. Tikal’s population is estimated at up to 60,000, giving it a population density several times greater than an average city in Europe or America at the same period in history.
A Maya city from the Classic Period usually consisted of a series of stepped platforms topped by masonry structures, ranging from great temple-pyramids and palaces to individual house mounds. These structures were in turn arranged around broad plazas or courtyards. Maya architecture is characterized by a sophisticated sense of decoration and art, expressed in bas-relief carvings and wall paintings. At major sites like Tikal, large buildings and complexes
A. the land area was usually bigger than that of an average European city at the time
B. the number of individual structures was larger than that of an average European city at the time
C. the population was larger than that of an average European city at the time
D. the population density is greater than that of an average European city at the time

[单项选择]Family meals often descend into ritual battles over healthy greens: how many children must consume, and how many treats they will earn as a result. The (62) may be higher than parents realize. According to a study newly released, a sugary, fat-laden Western diet brings profound changes on children’s gut bacteria, and could even (63) the risk of asthma, allergies and other inflammatory (发炎的) diseases.
Rates of inflammatory disease have been rising for decades among adults and children alike. (64) , this increase has occurred largely in developed countries, (65) poorer places. This has (66) scientists struggling to pinpoint exactly what about the rich world is making people sick. New data from Paolo Lionetti, of the University of Florence in Italy, supports the view that diet may be the culprit (元凶).
Dr.Lionetti and his colleagues (67) the diets and gut bacteria of 14 healthy children from a village in Burkina Faso with a grou