阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式（不多于3个单词）

Have you heard of a student awarded master’s dgree? Of curs. But the following student is quite different. Because she is  小题1: blind and dead. She is  小题2: combination of disabilities that is one of the mot severe known to mankind. Mrs Michelle Smithdas 小题3: (enjoy) a special success when she was awarded a masters degree at teachers’ College, New York, in the spring of 2005.

She did it with a lot of help from a lot of friends and   小题4:  (volunteer). Michelle, who received her degree in education of blind and visually impaired (受损的)learners,   小题5:  （believe）to be the first to gain a graduate degree from a top, famous university. She is an instructor at the Helen Keller National Centre in Sands Poit, New York,  小题6:  she teaches Braille, vocabulary,sign language and   小题7:  communicatio skills to those who are deaf-blind like her. For five years, she was driven to and from New York City for her classes by Mrs Linda Stillman, who also served  小题8: her interpreter. During classes, Mrs Stillman would sit next ot Michelle and hold her hand, using the manual alphabet (also known as finger-spelling) to communicate.Michelle also participated fully in class, going on al field trips and  小题9: (ask) questions in class. Outside class, many of her friends and helpers helped her read text books and write research papers.

According to one professor at Teachers’ College, Michelle was  小题10: only a fine student but also an inspriration to us all. Michelle

如图所示，在以0点为圆心、半径为R的圆中，AC、BD为互相垂直的两条直径．电荷量均为Q的正、负点电荷放在圆周上，它们的位置关于AC对称，+Q与O点的连线和OC夹角为30°．下列说法正确的是（　　）

A．O点的场强大小为

B．O点的场强大小为

C．A点的电势低于C点的电势

D．电荷量为q的正电荷在B点的电势能大于在D点的电势能