That what the writers described in their works is social realities and the main characters are common people is called().

单项选择题We can conclude that ().

A. civilization may be doomed if pollution is not controlled
B. pollution is more serious in Europe than it is in America
C. most people do not know that pollution is a serious problem
D. black snow is not so serious compared with white snow

单项选择题In the research mentioned in the last paragraph, the archaeologist expressed their concern on ().

A.how to preserve archaeological sites.
B.the influence of modern economy on archaeology.
C.destructive impact of volcanic eruption on human society.
D.the importance of using computer models in the archaeologist findings.