The epoch making technology refers to______ A.turning out manufacturing-patent B.burning used tires to make activated carbon C.opening the patented process to the public D.obtainingl.5 kilograms of activated carbon
A.turning B.burning C.opening D.obtainingl.5
【参考答案】
B 正确答案是:B。这是一道细节题。文章最后一段第一句话就提到:此外,北海道的一位研究员TakejiKobata......