“What is the saddest case you ever knew of ?”I asked the matron （护士长）of a hospital just retired. She thought for a minute小题1:______two and then replied, “It was a nurse I had, one of the most beautiful girls I ever saw. But she had a car accident and her face was so disfigured（毁容）小题2:______ she realized she would have to give up小题3:______（nurse）at least until she had had a long series of operations. She was engaged to be married but broke it小题4:______.”

The matron shook her head, remembering, “She was so miserable and小题5:______（depress）I feared for her sanity（心智健全）,”breaking into a smile. “Then I had小题6:______ idea. I took her one day to the `Blind Children’s Home`, and that afternoon she played with the children and for the first time I saw her happy. Just as we were leaving, a little blind girl put her arms小题7:______ her neck and said,` I do like your voice and I know you must have a lovely face, too.’ The nurse cried all the way home in the car, but it was with小题8:______（happy）, for she had found her life work with the blind children小题9:______came to call her their `lovely lady’.”

A sad case? Well, in a way, But小题10:______ a joyful ending!

下列光度单位中，唯一能引起眼睛视感觉的量是（）

A、照度

B、亮度

C、光通量

D、发光强度