My dad bought a computer when I was five years old。 I could draw pictures and listen to music on it。 But once， the computer was down suddenly。 My dad told me that it might be attacked by computer virus。

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I was so scared that I asked dad anxiously， "Did it get a flu? Did it need some medicine?" But dad laughed and said smilingly， "Don\'t be silly， son。 No medicine can cure a computer virus。 It\'s a problem of program。" I didn\'t understand what my dad said at that time。 But I made up my mind to study hard and to be a computer expert in the future。