On .one out of ten smokers may suffer from cancer. [ ]A．normal B．averageC．usual
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On________，one out of ten smokers may suffer from cancer.[ ]A．normal
B．average
C．usual
D．common
试题答案
B
On________，one out of ten smokers may suffer from cancer.[ ]A．normal
B．average
C．usual
D．common
B