Telling male and female spiders apart is easily done by ______.
举一反三
- Telling male and female spiders apart is easily done by ______. A: looking at the colors of them. B: looking at their eyes. C: distinguishing the shapes of their palps. D: counting their heads.
- 【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