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进程运行时，CPU访问的是用户空间的物理地址，Linux仅把当前要使用的少量页面装入内存，需要时再通过请页机制将特定的页面调入内存。

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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。

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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

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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

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