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本文介绍了一种特殊的、可以让作者在很远的城市为读者远程签字的签字笔the LongPen，并介绍了这种发明的起因以及发明过程。
1．What do we know about the invention of the LongPen?
A．It has been completed but not put into use.
B．The basement caught fire by accident.
C．Some versions failed before its test run.
D．The designers were well-prepared for the difficulty.
答案 C
解析 细节理解题。根据第三段第三句“The device went through several versions，including one that actually had smoke coming out of it.”可知，这个装置经历了很多次失败，最后才发明成功。故选C。
