单选题 无精子症患者，精液离心沉淀后经显微镜检查未见：（ ） A、精液 B、精子 C、精浆 D、非精子细胞成分 E、精子和非精子细胞成分

单选题老年人心肌细胞内常出现的色素是

单选题关于RNA的生物合成，下列哪项叙述是错误的

单选题高海拔地区的人易发生右心室肥厚，其原因是缺氧导致

单选题参与调节氧化磷酸化作用的重要激素是

单选题下列哪种疾病属纤维素性炎（ ）

单选题下列不符合湿性坏疽的描述是

单选题患有病毒性肝炎时，肝细胞灶状坏死将发生

单选题 排卵后子宫内膜呈分泌期变化是由于（ ） A、雌激素作用 B、孕激素作用 C、LH浓度升高 D、孕激素和雌激素共同刺激 E、FSH浓度升高

单选题 在描记家兔心电图时，通常选择哪个导联（ ） A、标Ⅰ B、标Ⅱ C、标Ⅲ D、aVR E、AVF

单选题下列不符合P53基因的描述是

单选题髓袢升支粗段对NaCl的继发性主动转运可造成

单选题在近端小管中滤出的HCO 3 － 被重吸收的方式为

单选题肝细胞癌的镜下特点是（ ）

单选题栓塞最常见的类型是

单选题第二信使DG与IP 3 在细胞内促进蛋白质磷酸化的酶是

单选题Starting with his review of Skinner's Verbal Behavior, Noam Chomsky had led the psycholinguists who argue that man has developed an innate (天生的) capacity for dealing with the linguistic universals common to all languages. Experience and learning then provide only information about the (1) instances of those universal aspects of language which are needed to communicate with other people within a particular language (2) . This linguistic approach (3) the view that language is built upon learned associations between words. What is learned is not strings of words per se (本身), but (4) rules that enable a speaker to (5) an infinite variety of novel sentences. (6) single words are learned as concepts: they do not stand in a one-to-one (7) with the particular thing signified, but (8) all members of a general class. This view of the innate aspect of language learning is at first not readily (9) into existing psychological frameworks and (10) a challenge that has stimulated much thought and new research directions. Chomsky argues that a precondition for language development is the existence of certain principles "intrinsic (原有的) to the mind" that provide invariant structures (11) perceiving, learning and thinking. Language (12) all of these processes; thus its study (13) our theories of knowledge in general. Basic to this model of language is the notion that a child's learning of language is a kind of theory (14) . It's thought to be accomplished (15) explicit instruction, (16) of intelligence level, at an early age when he is not capable of other complex (17) or motor achievements, and with relatively little reliable data to go on. (18) , the child constructs a theory of an ideal language which has broad (19) power. Chomsky argues that all children could not develop the same basic theory (20) it not for the innate existence of properties of mental organization which limit the possible properties of languages.

单选题同肝癌发生关系密切的是

单选题急性血吸虫卵结节内渗出的炎症细胞主要是

单选题人在高原地区，当吸入气的氧分压大于60mmHg时，血红蛋白氧饱和度为