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问题 选择题

镍—镉可充电电池可发生如下反应：Cd(OH)2＋2Ni(OH)2Cd＋2NiO(OH)＋2H2O，由此可知，该电池的负极材料是（ ）

A．Cd

B．NiO(OH)

C．Cd(OH)2

D．Ni(OH)2

答案

答案：A

充电相当于电解池，放电相当于原电池。在原电池中较活泼的金属作负极，失去电子，发生氧化反应。所以根据反应式可知放电时Cd是还原剂，失去电子，作负极，因此答案选A。

单项选择题

下列选项，不属天麻和全蝎主治病证的是（）

A.小儿急惊

B.脾虚慢惊

C.肝阳眩晕

D.风湿痹证

E.破伤风证
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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.

4（）

A.nonwhite

B.American

C.foreign

D.minor
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