问题详情

请就听到的内容作答______。 A) They were made only three times in Earth"s history. B) The most beautiful diamond comes from Africa. C) They are even harder than those saw blades. D) The hardness of diamonds depends on the purity. 此题为判断题(对，错)。请帮忙给出正确答案和分析，谢谢！