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It is more difficult to walk on a sandy road than on a concrete road because | |
A. | sand is soft and concreter is hard [Wrong Answer] |
B. | the friction between sand and feet is less than that between concrete and feet [Correct Answer] |
C. | the friction between sand and feet is more than that between concrete and feet [Wrong Answer] |
D. | the sand is grainy but concrete is smooth [Wrong Answer] |