问题
单项选择题
在十二指肠溃疡病人和，对照组中进行血型分布的大样本调查，血型分为O、A 、B、AB型，为比较病例组和对照组之间的血型分布的差异，需采用
A．u检验
B．t检验
C．配对的t检验
D．X2检验
E．以上都不是
答案
参考答案：D
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在十二指肠溃疡病人和，对照组中进行血型分布的大样本调查，血型分为O、A 、B、AB型，为比较病例组和对照组之间的血型分布的差异，需采用
A．u检验
B．t检验
C．配对的t检验
D．X2检验
E．以上都不是
参考答案：D
My mother goes to (去) the food shop every day. 31 has to buy many 32 of food because(因为) she has three children, one son and two 33 . I am her 34 . After school, I can help her do the housework(家务). Today(今天) is Sunday(周日). I go to 35 with my mother. In the shop, I find some food 36 very expensive(贵). We buy some cakes and bread. My little sister likes 37 very much. My mother buys 38 apple juice for my elder(大) sister. 39 I don’t buy anything(任何东西), because we have a 40 bag to carry (提).
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