问题 单项选择题

Defendants who can afford expensive private defense lawyers have a lower conviction rate than those who rely on court-appointed public defenders. This explains why criminals who commit lucrative crimes like embezzlement or insider trading are more successful at avoiding conviction than are street criminals.
The explanation offered above would be more persuasive if which one of the following were true

A.Many street crimes, such as drug dealing, are extremely lucrative and those committing them can afford expensive private lawyers.

B.Most prosecutors are not competent to handle cases involving highly technical financial evidence and have more success in prosecuting cases of robbery or simple assault.

C.The number of criminals convicted of street crimes is far greater than the number of criminals convicted of embezzlement or insider trading.

D.The percentage of defendants who actually committed the crimes of which they are accused is no greater for publicly defended than for privately defended defendants.

E.(E) Juries, out of sympathy for the victims of crimes, are much more likely to convict defendants accused of violent crimes than they are to convict defendants accused of "victimless" crimes or crimes against property.

答案

参考答案:D

解析: 本题为支持段落里所提供的解释,因此,可以用段落里解释的关键词“Defendants who can afford expensive private defense lawyer”与“those who rely on court-appointed public defenders”来定位可以很快发现选项(D)涉及双方且与解释相吻合;(A)部分反对;(B)用它因作为反对;(C)无关选项;(E)也是用他因作为反对。

填空题

(1)有机物A由C、H、O三种元素组成,其蒸气密度是同温同压下氢气密度的23倍,核磁共振氢谱显示其分子中有3种氢原子且个数比为3:2:1 。有机物A的分子式为          

(2)芳香化合物B的分子式为C78O,B能与金属钠反应,不与强碱反应。B中所含官能团的名称               ;B的同分异构体中能与FeCl3溶液发生显色反应的物质有多种,请任写一种结构简式                

(3)用A和B为原料完成以下转化:

已知:①两个醛分子间能发生如下反应:   

(﹣R、﹣R’表示氢原子或烃基)

③1mol H分别与足量的金属钠、碳酸氢钠溶液反应时,均生成22.4L气体(标准状况)。

回答下列问题:

① C + DE的反应类型为            ;EF反应的反应类型为____________。

②F的结构简式为:                                

③写出下列转化的化学方程式:

BD                                       

DK                                       

HI                                        

④满足下列条件的F有多种同分异构体,

Ⅰ. 该物质和FeCl3溶液能发生显色反应;

Ⅱ.该物质能使Br2的CC14溶液褪色;

Ⅲ.该物质分子中只有一个甲基。

写出其中苯环上取代基数目不同的任意两种同分异构体的结构简式                。    

问答题