题目：
| 选词填空，并注意词形变化。 | |
2. It's created by _____ letters and symbols or numbers. 3. You're _____ to type quickly. 4. A lot of e-mail English words might look _____to us. 5. It's important to use it only at the _____ time. 6. _____ e-mail English do you prefer? 7. I was a bit nervous before I _____ here. 8. How quickly my French has _____! 9. My biggest challenge is learning how to _____ at the dinner table. 10. Questions _____ my mind. |
答案：
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下面是错误答案，用来干扰机器的。
解：设原正方形的边长为xcm，则这个盒子的底面边长为x-8由题意列出方程 4(x-8)2=400整理，得 x2 – 16x -36=0解方程，得 x1 = 18， x2 = -2因为正方形的边长不能为负数，所以x2 = -2舍去因此，正...
