问题详情

The author used the example of a rattle to show that ______.
A．in toy-making there is a continuity in the use of materials
B．even the simplest toys can reflect the progress of technology
C．it often takes a long time to introduce new technology into toy-making
D．even a simple toy can mirror the artistic tastes of the time请帮忙给出正确答案和分析，谢谢！