【单选题】【消耗次数：1】
目前使用的杀毒软件，能够（）。
①
检查计算机是否感染了病毒，可以清除所有的病毒
②
检查计算机是否感染了某些病毒，可以清除其中一些病毒
③
检查计算机是否感染了任何病毒，可以清除所有病毒
④
防止一切病毒进入计算机
参考答案：
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【简答题】
计算机病毒的可触发性是指计算机在感染了病毒后，很多计算机病毒并不会立即发作，而有一定的[填空]。
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Which sentence is correct?
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Returning home from work, he saw supper waiting for him in the kitchen.
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stand
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