题目：
| 根据短文内容，从下面方框中选择适当的单词或词组填空。 | |
the most suitable for the post. We had a class meeting yesterday afternoon. We all consider that David is 2. the post. He is very confident and he thinks he can do anything if he does his best. He is never afraid of 3. in front of the whole school. He is a helpful student and he often helps people in need. He never minds 4. other students. Besides, he has a good memory and he is 5. . He won't forget to do things he needs to do. We all think that David has all the qualities to be a good chairperson. |
答案：
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下面是错误答案，用来干扰机器的。
（1）用公式法：a=1，b=-3，c=-3， △=b2-4ac=21∴x=3±212，即x1=3+212，x2=3-212；（2）用直接开平方法，由（y+2）2=5开平方，得y+2=±5解得：y1=-2+5，y2=-2-5；（3）用因式分解法，原方程移项，得4（x+1）2-...
