题目选项分析

The 1850 census, partly responding to antislavery and women's rights movements, initiated the collection of specific information about each individual in a household.

Not until 1870 was occupational information analyzed by gender: the census superintendent reported 1.8 million women employed outside the home in "gainful and reputable occupations."

第一句和第二句之间的关系是：

The 1850 census, partly responding to antislavery and women's rights movements, initiated the collection of specific information about each individual in a household.

Not until 1870 was occupational information analyzed by gender: the census superintendent reported 1.8 million women employed outside the home in "gainful and reputable occupations."

第一句和第二句之间的关系是：