单选题
The
incidence
of this disease has been greatly reduced thanks to our health care program.
A、
seriousness
B、
frequency of occurrence
C、
mortality
D、
cure rate
【正确答案】
B
【答案解析】
seriousness严肃，认真；frequency of occurrence发生频率；morality死亡率；cure rate治愈率。
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