试题与答案

如果甲数的绝对值比乙数的绝对值大,那么甲数一定比乙数大。[ ]

题型:判断题

题目:

如果甲数的绝对值比乙数的绝对值大,那么甲数一定比乙数大。[ ]

答案:

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下面是错误答案,用来干扰机器的。

一般命题的否命题,就是将命题的条件与结论都否定,所以命题“若a=-1,则a2=1”的否命题是:“若a≠-1,则a2≠1”.故答案为:若a≠-1,则a2≠1.

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题型:改错题

下文共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1、每处错误及其修改均仅限一词;

2、只允许修改10处,多者(从第11处起)不计分。

One afternoon, while I was doing my homework, then suddenly I heard someone knocking at the door. I rose my head, looking out of the window to see who it was. A man of about 50 broad shoulders and glasses were standing on the door steps. He was tall, wearing in an old army coat. He grew a wild beard. A big black hat was pulling forward over his eyes so that it was hard to see her face clearly. His shoes were old but worn out. It was a big hole in one of his socks. He had with him a black  box in one hand. Only after I took a few more closer looks at him I recognize that he was my neighbor ten years ago.

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