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.

单选题体循环动脉栓子主要来自

单选题冷水进入一侧耳内，可引起下列哪一变化，从而导致出现头晕和恶心等自主性功能改变

单选题结节性多动脉炎的病理特点是

单选题Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too. Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment./

单选题正常机体体温的昼夜节律变化表现为

单选题不是以酶原的形式存在的凝血因子是

单选题符合羊水栓塞的描述是

单选题A．淋巴道转移B．直接蔓延C．种植性转移D．椎旁静脉系统的转移

单选题基本转录因子中直接识别和结合TATA盒的是

单选题DNA双链中，不作为转录模板的一股单链是

单选题蛋白质的营养学热价为

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

单选题下列不符合软骨肉瘤的描述是

单选题关于人体内血管的神经支配，正确的是

单选题二尖瓣关闭不全不导致

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

单选题下述病变中，与大肠癌关系不密切的是