Visitors ________ not to touch the exhibits.

A．will request

B．are requested

C．are requesting

D．request

读图回答问题：

图一
图二

（1）说出图1、图2发明的名称及发明者。____________________________________________________________________________________________（2）图1中的发明使人类进入什么时代？____________________________________________________________________________________________（3）图1与图2两者有什么关系？____________________________________________________________________________________________（4）这两项发明均是哪一事件的成果？____________________________________________________________________________________________（5）通过上图，你从中得出了什么启示？

____________________________________________________________________________________________