2. 外语
  3. Crosby’s recent study of American historical demography is blithely based on the reconstitution of the records of single

Crosby’s recent study of American historical demography is blithely based on the reconstitution of the records of single

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问题             Crosby’s recent study of American historical demography is blithely based
       on the reconstitution of the records of single parishes, a method that often
       excludes migrants.  Moreover,  it is troublesome for historians to obtain
Line    information on the birthdates of people who relocated to the parish, and equally
(5)     difficult to follow those who had migrated to new places of residence. Thus, the
       exclusion of migrants also followed from the way spatial units were once
       conceived by the parishioners themselves, a stable and unchanging pre-modern
       countryside of interchangeable towns unlike "modern" flows to cities.
            As a result, migration was improperly assumed to be irrelevant because the
(10)    small units in the countryside were interchangeable and migrants into a parish
       could thus stand as a proxy for those who had left. In any case, it was thought
       that migration in the countryside was repetitive and occurred only in response to
       life course events, such as finding a spouse, and thus, like the parishioners
       themselves, Crosby complacently equates the demographics of migrants to those
(15)    of more sedimentary populations.
The passage suggests that one major difficulty in establishing patterns of migration is
选项 A、the infrequency of life course events, which restricts the amount of data available to demographers
B、the overwhelming availability of proxies in migration patterns, which creates a degree of stasis in migration records
C、the lack of parishioner birth records, which limits the hard evidence upon which demographers base their observations
D、the homogeneity of single parishes, which makes it difficult to distinguish the motivations of migrants
E、the repetitive nature of migration, which results in a surfeit of unusable data that overwhelms demographers
答案C
解析
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