题目

Nowadays, _______________ farmers leave their hometown to search for work in the cities. A . million of B . two millions C . millions of D . two millions of 答案：C次央是集邮爱好者，她用焦距为15cm的放大镜去观察邮票时，邮票与放大镜的距离应________15cm（填“大于”，“小于”或“等于”），所成的是________放大的________像．