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问题 单项选择题

计算机病毒是______。

A．一种用户误操作的后果

B．一种专门侵蚀硬盘的霉菌

C．一类具有破坏性的文件

D．一类具有破坏性的程序

答案

参考答案：D

解析： 病毒是一类具有破坏性的程序，它能够对用户的数据、程序造成严重的破坏，具有很强的传染性。

填空题

词汇运用。

     Yesterday afternoon, when I was on my way home, it began to rain. I (1)f______ (感觉) worried,

because I didn't bring my (2)______ (雨伞). My hair and my clothes were all wet. When I went past a

(3)______ (银行), I saw a boy riding a bike fast. 　(4)______ ( 突然) he (5)______ (跌落) down. I ran to

him at once. (6)______ (幸运地), he was not badly hurt. I wanted to take him to the hospital. At that time,

my parents brought some warm clothes and a raincoat to me. They were (7)______ (自豪的；骄傲的) of me,

because I was so kind. Then we took the boy to the hospital (8)______ (一起). Soon, the boy's parents came

and they thanked us again and again. When we got home, it was (9)______ (已经) late. We were still happy

because it's a (10)______ (令人愉快的) thing to help others.

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单项选择题

两样本均数比较的假设检验，按α=0.05水准，认为差异有显著性，此时若推断有错，其错误的概率是（）。

A．大于0.05

B．小于0.05

C．等于0.05

D．β，而具体数值未知

E．1-β
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