According to the passage, how are ants guided by trail pheromones（）
A. They concentrate on the smell of foo
B. They follow an ant who is familiar with the trail
C. They avoid the vapor spaces by moving in a straight lin
D. They sense the vapor through their antenna
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The passage mainly discusses which of the following aspects of the life of Archaic peoples（）
A. The principal sources of food that made up their diet
B. Their development of ground stone tool technology
C. Their development of agriculture
D. Their distribution of work between men and women
The word "furnish" in line 16 is closest in meaning to（）
A. include
B. provide
C. cover
D. select
IT can be inferred from the passage that Europa and Antarctica have in common which of the following（）
A. Both appear to have a surface with many craters
Both may have water beneath a thin,hard surface
C. Both have an ice can that is melting rapidly
D. Both have areas encased by a rocky exterior
The author mentions the trail pheromone of the leafcutter ant in line 11 to point out（）
A. how little pheromone is needed to mark a trail
B. the different types of pheromones ants can produce
C. a type of ant that is common in many parts of the world
D. that certain ants can produce up to one milligram of pheromone
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