单项选择题
How many calories per gram of oil can provide?
A. 9 kcal
B. 4 kcal
C. 2 kcal
D. 12 kcal
How many calories per gram of oil can provide?
A. 9 kcal
B. 4 kcal
C. 2 kcal
D. 12 kcal