听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 People create viruses in this order:______.

A. write the code — test it — make sure it spreads properly
B. release the virus — test it — make sure it spreads properly
C. make sure it spreads properly — lest it — release the viruses