第11题: [单项选择]男孩,3岁,生后反复患肺炎、腹泻、脑膜炎,2周前因患败血症死亡。曾化验血清IgG7.6/L,IgA0.76/L,IgB0.056/L,细胞免疫功能测定正常,外周血淋巴细胞数正常,骨髓找到浆细胞。最可能的诊断是() A. X连锁无丙种球蛋白血症 B. 选择性IgA缺陷症 C. 婴儿暂时性低丙种球蛋白血症 D. 获得性免疫缺陷综合征 E. 选择性IgM缺陷症 参考答案:E 答案解析:血清IgM低于20mg/dl,而其他免疫球蛋白类别的水平正常,诊断考虑选择性IgM缺陷症。
第30题: [单项选择]The subject ______ we are going to turn is about English studies. A. about which B. with which C. about that D. to which 参考答案:D 答案解析:[解析] turn to有“致力于……”的意思。to为介词,which引导一个定语从句,修饰先行词“the subject”。
第31题: [单项选择]According to the protectionist, U.S. needs "offshoring" because of_______. A. the lack of skilled domestic workers B. the unproductivity of domestic workers C. the need to improve global competitiveness D. corporate greed for profits 参考答案:D 答案解析:细节题。题目问的是:按保护主义者的说法,美国需要“海外劳工”是因为______。文章第六段从第三句开始提到:“offshoring”,... isn't necessitated by any lac