在进程的task_struct结构中，有一个字段mm指向mm_struct结构，mm_struct结构中各个区域的起始和结束字段描述了进程地址空间的各个虚存区（VMA），而各个VMA只能通过单链表链接关系。
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一个进程的用户地址空间主要由mm_struct结构和vm_block_structs结构来描述。
What do the three different circles represent in the figure of six proposed Sustainable Development Goals by Griggs et al.(adapted from Griggs, D., et al (2013) Nature).Please select one correct answer
A. Economy, Society and Atmosphere
B. Ecology, Society and Population Ecology, Society and Population - incorrect
C. Environment, Society and Economy
D. Ecology, Society and Sustainability
What is the best solution to sustainably feed a growing urban population?(Please select one answer)- unanswered
A. Sustainable Intensification of existing agriculture land
B. Increasing organic production
C. Eating less meat
D. Agroforestry
E. Urban agriculture
F. There is no panacea – we need many solutions so all of the above are part of the solution
In what ways does urbanization represent an opportunity for sustainable development?(Please select four answers)- unanswered
A. With 60% of urban areas that still to be built, there is an opportunity to get urban development on a green path
B. Cities can act as hubs of innovation
Cities are urban heat islands, which leads to thriving biodiversity
D. Cities can be built to provide ecosystem services to urban residents, such as the generation of a cooling effect through planting trees
E. Cities can represent unique learning and education platforms
F. Cities will always lead to decreased consumption
G. Places with higher population densities are always behave more sustainably
H. People living in cities will be more protected from extreme weather events due to climate change
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