The incidence of this disease has been greatly reduced thanks to our health care program.

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问题 The incidence of this disease has been greatly reduced thanks to our health care program.

选项 A、seriousness
B、frequency of occurrence
C、mortality
D、cure rate

答案B

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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