The odd function y = f (x) defined on R, given that y = f (x) has three zeros in the interval (0, + ∞), then the number of zeros of function y = f (x) on R is () A. 5B. 6C. 7D. 8

The odd function y = f (x) defined on R, given that y = f (x) has three zeros in the interval (0, + ∞), then the number of zeros of function y = f (x) on R is () A. 5B. 6C. 7D. 8

∵ function y = f (x) is an odd function defined on R, ∵ f (- x) = f (x). When x = 0, f (0) = 0, and the image of F (x) is symmetric about the origin, ∵ y = f (x) has three zeros in the interval (0, + ∞), and ∵ y = f (x) also has three zeros in the interval (- ∞, 0), so the number of zeros of function y = f (x) on R is 1 + 3 + 3 = 7