题目

     Paper is one of the most important products ever invented by man. The invention of paper meant that more people could be educated because more books could be printed. Paper provided an important way to communicate with knowledge. Paper was first made in China about 2,000 years ago. In Egypt and the West, paper was not very commonly used before the year 1400. Paper was not made in southern Europe until about the year 1100. After that, the forest countries of Canada, Sweden, Norway, Finland, and the United States became the most important in paper-making. Today Finland makes the be凸透镜的焦距是10cm，把点燃的蜡烛放在距凸透镜15cm处，则蜡烛通过凸透镜成的像是（ ）A.倒立、缩小的实像 B.正立、缩小的实像C.倒立、放大的实像 D.正立、放大的虚像