【单选题】生成如下数据框的语句是? weight height gender age 1 80 180 male teen 2 75 170 male teen 3 60 165 female adult 4 52 150 female adult A. X ,gender=c("male", "male", "female", "female"),age=c("teen","teen","adult","adult")) B. X ,gender=c("male", "male", "female", "female"),age=c("teen","teen","adult","adult")) C. X ,gender=c(male, male, female, female),age=c(teen,teen,adult,adult)) D. X ,gender=c("male", "male", "female", "female"),age=c("teen","teen","adult","adult"))

'surplus male and female' means single or unmarried male and female.

male and female are more likely

dorm for male and female students

The male of all beasts and birds is ________ and the female __________.

a male or female interviewee must wear a suit.

There are about the same number of male and female migrants.

There are(differ) ______ between a male and a female in some aspects.

In Chinese philosophy, “阴”refers to the __________ principle while “阳” refers to the _________ principle. A: cold, hot B: cloudy, sunny C: female, male D: male, female

In Israel, when a female offers to pay while eating with a male, the male will accept it without argument.