问题
选择题
When your computer begins to run slow, it is a ______ that it has been attacked by computer virus. [ ]
A. signal
B. symbol
C. reality
D. character
答案
答案：A
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When your computer begins to run slow, it is a ______ that it has been attacked by computer virus. [ ]
A. signal
B. symbol
C. reality
D. character
答案：A