In physics, it is more difficult to walk on a sandy road than it is to walk on a concrete road because…
A. Sand is soft and concrete is hard
B. The friction between sand and feet is less than that between concrete and feet
C. The friction between sand and feet is more than that between concrete and feet
D. The sand is grainy whereas concrete is smooth
Type of SentencesGrammarFuture Continuous Tense
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