单项选择题

The argument in the last paragraph is based on ______.

A．scientific research
B．historical records
C．social investigation
D．reference to religious literature
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单项选择题
The writer's attitude toward abortion is ______.
A．unclear
B．negative
C．positive
D．ambivalent
单项选择题
The Houston billboard advertisement is possibly made by ______.
A．a couple to seek a surrogate mother
B．a woman to bear a child for childless couples
C．a doctor to provide medical assistance for childless couples
D．an agency to seek surrogate mothers
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