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【单选题】
计算麻疹疫苗接种后血清检查的率,分母为
A.
麻疹易感儿数
B.
麻疹患儿人数
C.
麻疹疫苗接种人数
D.
麻疹疫苗接种后的人数
E.
麻疹易感儿数加上麻疹患儿人数
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【单选题】In the old days, children were familiar with birth and death as part of life. This is perhaps the first generation of American youngsters who had ever been close by during the birth of a baby and baby...
A.
were quite unfamiliar with birth and death
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had often experienced the fear of death as part of life
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usually witnessed the birth or death of a family member
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were often absent when a family member was born or dying
【单选题】In the old days, children were familiar with birth and death as part of life. This is perhaps the first generation of American youngsters who had ever been close by during the birth of a baby and ever...
A.
were quite unfamiliar with birth and death
B.
had often experienced the fear of death as part of life
C.
usually witnessed the birth or death of a family member
D.
were often absent when a family member was born or dying
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B.
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D.
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【单选题】请选择与单词“elegant”词义一致的选项
A.
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B.
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C.
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