The word "adequate" in line 18 is closest in meaning to（）
A. sufficient
B. healthful
C. varied
D. dependable
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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
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
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