A、
Their average life span was less than 50 years.
B、
It was very common for them to have 12 children.
C、
They retired from work much earlier than today.
D、
They were quite optimistic about their future.
【正确答案】
A
【答案解析】
原文中的the year of 1900与题目重现,据此定位。原文中的didn't live beyond与选项A中的was less than对应;原文中的50与选项A重现。故答案为A。life span意为“寿命”。
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