单选题:What is a "benign" virus?

题目内容:
What is a "benign" virus? A. It is a virus that causes great damag
B. It is a virus that once infected the IBM's computer syste
C. It is a virus that carries a Christmas greetin
D. It is a virus that causes no harm to the computer system
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答案解析:

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生态系统的两大部分是__________和非生物环境(非生命部分)。

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