单选题A new study finds that blacks on death row (1) of killing whites are more likely to be executed than whites who kill minorities. It also concludes that blacks who kill (2) minorities are (3) likely to be executed than blacks who kill whites. For example, there is more than a twofold greater risk that an African-American who killed a white will be executed than a white person who kills a (4) victim. A Hispanic is at least 1.4 (5) more likely to be executed (6) such an offender kills a white. The researchers of the study believe that there are two (7) explanations.. First, prosecutors often win (8) office if they win well-publicized cases. When a black kills a white, such killings gets more (9) and this idea can be (10) by many famous cases. (11) , the court judges at the state level are often (12) to elections, called retention elections. Retention election or judicial retention within the United States court system, is a periodic process, in which the voter (13) approval or disapproval for the judges presently (14) their position, and a judge can be removed from the position if the (15) of the citizens vote him or her out. Just as the researchers (16) out, death penalty is (17) political. The findings of the study, in short, show that American justice systems clearly (18) white lives more than those of blacks or Hispanics. The researchers also say their findings (19) serious doubts about (20) that the U.S. criminal justice system is colorblind.

单选题DNA双链中，不作为转录模板的一股单链是

单选题 关于钙稳态失衡引起细胞凋亡的机制，不正确的是 A、激活核转录因子，加速凋亡相关基因转录 B、胞质中浓度显著下降起关键作用 C、使DNA舒展，暴露酶切点 D、激活谷氨酰胺转移酶，使细胞骨架蛋白广泛交联 E、有利于凋亡小体形成

单选题关于糖皮质激素对代谢的影响，下列哪项是错误的( ) A．促进肝外组织蛋白质分解 B．促进肾保钠、排钾、排水 C．促进糖异生 D．减少外周组织对葡萄糖利用 E．促进全身各部位的脂肪分解

单选题A．1min内B．7min内C．10～15min内D．20～25min内E．25～30min内

单选题导致肺心病的关键环节是

单选题体循环动脉栓子主要来自

单选题安静时K+由细胞内流向细胞外属于( ) A．单纯扩散 B．通道转运 C．载体转运 D．主动转运 E．出胞作用

单选题“虎斑心”是指心肌细胞发生 A．淤血 B．脂肪变性 C．黏液变性 D．坏死 E．淤血及脂肪变性

单选题评价肺通气功能较好的指标是( ) A．最大通气量 B．用力呼气量 C．每分通气量 D．补呼气量 E．肺泡通气量

单选题 鼻咽癌常见的大体类型是 ( ) A、结节型 B、菜花型 C、黏膜下型 D、溃疡型 E、浸润型

单选题触发神经末梢释放递质的离子是

单选题A．上臂周径测量B．三甲基组氨酸测定C．血浆前白蛋白测定D．三头肌皮皱厚度

单选题从下蹲位突然站立而发生晕厥的原因是 A．低垂部位静脉舒张 B．血液发生倒流 C．心率突然减慢 D．压力感受性反射敏感性降低

单选题少尿是指尿量______

单选题 胃肠道平滑肌的功能合胞体特性的形成原因是（ ）。 A、平滑肌细胞都有基本电节律 B、慢波总是从纵行肌向环行肌传播 C、动作电位的产生都是在慢波的基础上进行的 D、平滑肌细胞间存在着融合膜，此处电阻低，局部电流容易从一条平滑肌传到另一条上

单选题K + 通道和Na + 通道阻断剂分别是

单选题耳蜗底部受损将导致

单选题A．绒毛水肿，滋养层细胞增生B．异型增生滋养层细胞浸润深肌层，但可见绒毛结构C．异型增生滋养层细胞浸润深肌层，无绒毛结构，出血、坏死明显D．在胎盘种植部位滋养层细胞浸润肌层，无出血、坏死

单选题与系统性红斑狼疮引起的组织损害有关的因素主要为