问题
选择题
_______ average, one out of ten women above the age of 50 suffers ________ insomnia (失眠). [ ]
A. On; from
B. In; from
C. On; by
D. In; by
答案
答案：A
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_______ average, one out of ten women above the age of 50 suffers ________ insomnia (失眠). [ ]
A. On; from
B. In; from
C. On; by
D. In; by
答案：A