阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。 Plugging into Electronic Databases If you are looking (36) information, library shelves are a good place (37) . But if you need up-to-the-minute data or have specialized needs, you may (38) a computerized database more useful, (39) expensive, and less time consuming. A database, a file of (40) on one subject or family of subjects, can be (41) and maintained in a computer’s memory. The speed of the computer then enables you (42) any item in this file almost instantly. The three main types of databases are statistics, bibliographies, and full text. Statistical databases store vast (43) of numerical data, such as wage and price indexes, census information, foreign exchange rates, and bond prices, bibliographic databases store references and (44) of articles (45) periodicals and newspapers. Full-text databases offer the complete texts of such materials (46) newspaper, magazine and journal articles. (47) databases exist today, and their numbers are (48) . Many companies have their (49) database, (50) is accessible (51) employees through computer terminals or microcomputers.(52) addition, several hundred commercial data bases are now available (53) the public, (54) literally millions of information readily retrievable. These databases cover specific fields, such as law and financial (55) , or general information, such as sports and weather data.
A. to find
B. find
C. found
D. finding
男婴,6个月。于生后接种卡介苗后引起全身反应。近3~4个月来,感染绵延不断,常患鹅口疮、上呼吸道感染及腹泻肠炎。各项免疫球蛋白测定均低,OT试验多次阴性,E花环试验低于正常。X线胸片:胸腺影缺如。
A. X-连锁无丙种球蛋白血症
B. 婴幼儿暂时性低丙种球蛋白血症
C. 胸腺发育不全
D. 共济失调性毛细血管扩张症
E. 普通变异型免疫缺陷病(CVID)