化简下列各式的符号，并回答问题：

（1）﹣（﹣2）；（2）+（﹣$\frac{1}{5}$）；（3）﹣﹣（﹣4）（4）﹣﹣（+3.5）；（5）（﹣{﹣﹣（﹣5）}）（6）﹣{﹣﹣（+5）}

问：①当+5前面有2012个负号，化简后结果是多少？

②当﹣5前面有2013个负号，化简后结果是多少？你能总结出什么规律？

3个 $\frac{\text{1}}{\text{4}}$ 与6个 $\frac{\text{1}}{\text{8}}$ 所表示的分数是一样大的．

⑴I'm hungry.____                       A. She's running.

⑵What are you doing?____       B. He's making noodles.

⑶What are they doing?____      C. I'm hungry, too.

⑷What is she doing?____          D. They are rowing a boat.

⑸What is Sam doing?____         E. I'm reading a book.