Which of the following fall within the range of ratios of hours spent biking to hours spent swimming per week in this four week period?Indicate all possible values.
A.1:4
B.1:2
C.2:1
D.3:1
E.3:2
我的答案：
Which of the following fall within the range of ratios of hours spent biking to hours spent swimming per week in this four week period?Indicate all possible values.
