It can be inferred from the passage that the city of Memphis sponsored a work by Richard Hunt because the city authorities believed that（）
A. the sculpture would symbolize the urban renewal of Memphis
B. Memphis was an appropriate place for a memorial to Martin Luther Ling, Jr.
C. the artwork would promote Memphis as a center for the arts
D. the sculpture would provide a positive example to other artists
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In line 7, the another mentions "cracks in an eggshell" in order to help readers（）
A. visualize Europa as scientists saw it in the Voyager 2 images
B. appreciate the extensive and detailed information available by viewing Europa from far away
C. understand the relationship of Europa to the solar system
D. recognize the similarity of Europa to Jupiter's other moons
The phrase "are easily disposed" in line 11 is closet in meaning to（）
A. demonstrate reluctance
B. readily encourage others
C. have a tendency
D. often fail
What does the passage mainly discuss（）
A. The mass migration of ants
B. How ants mark and follow a chemical trail
C. Different species of ants around the world
D. The information contained in pheromones
The plant "sumpweed" is mentioned in line 25 in order to（）
A. contrast a plant with high nutritional value with one with little nutritional value
B. explain the medicinal use of a plant
C. clarify which plants grew better in places where trees were not cut down
D. provide an example of a plant that was easy to domesticate
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