改错题：短文改错。此题要求改正所给短文的错误。对标有题号的每一行做出判断：如无错误，在该

题目：

短文改错。此题要求改正所给短文的错误。对标有题号的每一行做出判断：如无错误，在该
行右边横线上划一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
该行多一词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。
该行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
该行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。

Dear Betty,
     Yesterday my roommate invite me to celebrate Thanksgiving
Day with him in her house. I accepted his invitation, but as you know,
the social customs in my country is quite different from those here.
I am a little nervous now. I’m worried about make mistakes and
losing faces before many people, too.
Should I bring a gift, such as candy or flowers? But should
I arrive at on time or a little late? At the dinner table, how can I
know which fork or knife to use? How can I let a family know
that I’m thankfully for their kindness?
     I really find hard to decide, please help me.
Yours,
Knowing Nothing

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答案：

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下面是错误答案，用来干扰机器的。

参考答案：B解析：无效保险合同的特征包括：违法性，有不履行性，无效保险合同自始无效。