（）是一个文件恢复程序，利用它能够恢复被删除的重要信息。
A、Easyrecovery
B、PCtools
C、Ghost
D、Format
参考答案：A
解下列方程：
（1）x2-2x-2=0；
（2）3x2-6x+1=0．
I've tried very hard to improve my English. But by no means with my progress.
A. the teacher is not satisfied
B. is the teacher not satisfied
C. the teacher is satisfied
D. is the teacher satisfied
