在进行“探究凸透镜成像的规律”的实验时，把一支点燃的蜡烛放在距离凸透镜2倍焦距以外的地方，调节光屏位置，可找到一个清晰的像，这个像是图的（　　）

短文改错

    My friend Henry, with who I studied in the same class, didn't like studying at school. That's because he couldn't go to high school. He had to return back to his hometown, where his father wished him to learn to manage our small shop. However, the young man was not interesting in it and didn't do as his father said. He spends a lot of time reading and he also learned how to repair cars. Last month, I received an e-mail from him inviting me take my vacation on his hometown. I started off. Seeing that he was such successful, I said, “Henry, all road lead to Rome. You are great!”

实验室加热高锰酸钾制氧气，可直接采用的发生装置是（　　）