患者，女性，32岁，反复口腔溃疡3年，双眼球周围经常发红，伴飞蚊感，轻度关节痛。1年前始反复出现双下肢结节红斑。尿液检查提示：RBC3～5/HP。最可能的诊断是（）.

A.系统性红斑狼疮

B.白塞病

C.显微镜下多血管炎

D.原发性干燥综合征

E.系统性硬化病

In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words（1）which we become acquainted in daily conversation, which we（2）,that is to say, from the（3） of our own family and from our familiar associates, and（4） we should know and use （5 ）we could not read or write. They （6） the common things of life, and are the stock in trade of all who （7） the language. Such words may be called“popular”, since they belong to the people （8） and are not the exclusive （9） of a limited class. On the other hand, our language （10） a multitude of words which are comparatively （11） used in ordinary conversation. Their meanings are known to every educated person, but there is little （12） to use them at home or in the market-place. Our （13） acquaintance with them comes not from our mother's （14） or from the talk of our school-mates, （15） from books that we read, lectures that we （16） ,or the more （17）conversation of highly educated speakers who are discussing some particular （18） n a style appropriately elevated above the habitual（19） f everyday life. Such words are called“learned”, and the （20） between them and the“popular”words is of great importance to a right understanding of linguistic process.

请在19处填上正确答案（）

A.border

B.link

C.degree

D.extent