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问题 解答题

某同学周末在家自制了一个三角形木架，经测量其三边分别为(2x+1)cm， (3x-2)cm，(8-2x)cm.请你帮他计算这个三角形的周长？如果x=3，那么这个三角形的周长是多少？

答案

解：三角形的周长是(3x+7)cm，当x=3时，三角形的周长是16 cm

改错题

文中共有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（∧），并在其下面写出该加的词。

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.每处错误及修改均仅限一词；

2．只允许修改10处。

I think there is no easy way to succeed in teaching a new language.

A good memory is a great help. However, it is not much use learning by

heart long lists of words and its meanings. We must learn by using language.

“Learn through practice” is a piece of good advice for those which are

learning a new language. Practice is very important. We must practise to

speaking and writing the language so much as we can. We learn to swim by

getting onto the water and swim. And we learn to speak a new language by

speaking it and not by being telling about it.
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单项选择题

不造成肠粘膜损伤的腹泻致病菌是

A．空肠弯曲菌

B．耶尔森菌

C．金葡菌

D．产毒性大肠杆菌

E．侵袭性大肠杆菌
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