According to paragraph 4, how can the independent development of civilization in different
A. Scholars agree that food surpluses encouraged populations to be concentrated in certain areas.
B. There are several theories that explain the rise of civilization in the ancient world.
C. The model of civilization was probably carried from one region to another along trade routes.
D. Historians attribute the emergence of early cities at about the same time as a coincidence.
查看答案
A．formationB．allianceC．combinationD．separation
A. formation
B. alliance
C. combination
D. separation
The word hardly in the passage is closest in meaning to
A. frequently
B. likely
C. barely
D. obviously
In paragraph 7, why does the author use the example of the Acacia tree？
A. To demonstrate how ants survive by living in trees
B. To explain how two species can benefit from contact
C. To show the relationship between plants and animals
D. To present a problem that occurs often in nature
The word prominent in the passage is closest in meaning to
A. weak
B. important
C. small
D. new
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