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题目材料:

Which of the following, if true, most helps to explain why the time spent washing clothes increased in rural areas?
  • APeople with access to an electric washing machine typically wore their clothes many fewer times before washing them than did people without access to electric washing machines.
  • BHouseholds that had sent their clothes to professional laundries before 1925 were more likely than other households to purchase an electric washing machine when they became available.
  • CPeople living in urban households that had previously sent their clothes to professional laundries typically owned more clothes than did people living in rural households.
  • DThe earliest electric washing machines required the user to spend much more time beside the machine than do modern electric washing machines.
  • EIn the 1920`s and 1930`s the proportion of rural households with electricity was smaller than the proportion of urban households with electricity.

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