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
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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
下面情形中，不属于主管税务机关可要求房地产开发企业进行土地增值税清算的是( )。
A. 取得销售(预售)许可证满3年仍未销售完毕的
B. 整体转让未竣工决算房地产开发项目的
C. 纳税人申请注销税务登记但未办理土地增值税清算手续的
D. 已竣工验收的房地产开发项目部分销售，其余可销售部分自用或出租的
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