第24题: [单项选择]The 15 plates of the Earth are formed from________. A. the oceanic crusts and continental crusts B. the crusts and the mantle C. the crusts and the top and solid part of the mantle D. the continental crests and the solid part of the mantle 参考答案:C 答案解析:这是一道细节题,题目是第一段倒数第三句话“The crusts and the top,solid part of the mantle,...,at present appear to consis