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

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 空格处的意思是：这种疾病的发病率大大减少要感谢我们的医疗保健项目。划线单词incidence的意思是“发生(率)；影响；影响的方式”。各选项的意思是：seriousness“严肃，认真”；frequency of occurrence“发生频率”；mortality“死亡率”；cure rate“治愈率”。
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