多个样本的率或构成比的比较，可理解为检验两个分类变量的取值是否相互关联，或者检验一个变量(如性别)的取值不同是否对另一个变量(血型)的取值有影响，也称为相关问题。
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There are_________ days in a week.
A. the seven
B. seventh
C. the seventh
D. seven
Thirty-six minus five is ________ .
A. the thirty-one
B. thirty-one
C. thirty-first
D. the thirty-first
My mother’s birthday is on the _______of March.
A. three
B. third
C. the second
D. one
There is no ______ in the bowl.
A. apples
B. bananas
C. rice
D. eggs
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