单选题
According to the passage, computer viruses seem to ______.
A、
have been in nature for years
B、
be difficult to get rid of at the present
C、
be found in any computer
D、
be able to get rid of in the near future
【正确答案】
B
【答案解析】
[解析] 事实细节题。由文章一句话But till now，how to get rid of the terrible viruses remains a problem．“但是直到现在，如何消灭病毒仍然是个问题。”可知目前电脑病毒似乎很难消灭。
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