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问题 单项选择题

判断无症状心肌缺血如属不能作心电图运动试验者，最常用的方法为()

A．二维超声心动图

B．核素左心室造影

C．运动201铊心肌显像

D．常规静息心电图

E．动态心电图

答案

参考答案：E

选择题

植物园里的几株国家二级保护植物——蕨类植物桫椤感染了植物病毒，为了培育出大量无病毒的桫椤植株，你认为应采取的方法是 [ ]

A．用带毒植株的种子培养后代

B．用带毒植株无明显症状的枝条扦插

C．用带毒植株的茎尖进行组织培养诱导出植株

D．用带毒植株的叶经组织培养诱导出植株

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单项选择题

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.

10（）

A.supported

B.approved

C.ratified

D.hold
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