社会主义制度在我国初步建立的标志——__________________
三大改造的基本完成
What does the passage mainly discuss a. Trends in teaching mathematics to children. b. The use of mathematics in child psychology. c. The development of mathematical ability in children. d. The fundamental concepts of mathematics that children must learn.
12个啤酒空瓶可以免费换1瓶啤酒，现有101个啤酒空瓶，最多可以免费喝到的啤酒为：（）
A．8瓶
B．9瓶
C．10瓶
D．11瓶
