描述一组偏态分布资料的变异度，最适用的指标是A．方差 B．标准差 C．变异系数 D．

患者，男，30岁，受到多种细菌感染，并发现缺乏C3成分，那么在该患者中哪些由补体介导的功能将不会受到影响（）

A.裂解细菌

B.对细胞的调理

C.产生过敏毒素

D.产生中性粒细胞趋化因子

E.调节血小板的功能

Some years ago, a Miami woman walking through an office building noticed two men standing together．Several minutes after her leaving, the men murdered a person working in the building．The police determined that the woman was the only witness and could possibly describe them．However, her memory of the men proved disappointingly unclear．Several days later, psychologist Ronald Fisher was brought in to obtain a more complete account from the woman．His interview produced a breakthrough—the woman reported a clear picture of one of the suspects．The important information enabled the police lo arrest the suspect and close the case．

The police asked Fisher for help because of his rich knowledge in cognitive interview, a kind of memory - rebuilding process．Memory researchers have found that people trying to remember a past event often only recall part of the relevant information．Human memory is selective and it is often distorted by stress．But a person's accurate recall of an event or understanding of a question can be improved using specific interviewing techniques．The "cognitive interview" was developed in the late 1990s．It encourages the witness to take an active role in recalling information rather than giving answers only to someone else's questions．The witness first describes what happened in his or her own words, with no interviewer interruptions．The interviewer then goes further with specific techniques, such as having the witness tell the details of what happened from different perspectives （角度）．

The cognitive interview focuses on guiding witnesses through four general recalling techniques: thinking about physical surroundings and personal feelings that existed at the time of past events; reporting everything that conies to mind about those events, no matter how broken it is retelling events in a variety of time orders, such as from beginning to end, end to beginning, forward or backward; and adopting different perspectives while recalling events．

Experiments with police detectives trained in this demanding interview method find that they obtain nearly 50% more information from witnesses than before training, while error rates remain about the same．It is proved that cognitive interviews are quite important tools in improving the accuracy and completeness of witness testimony （证词）．

67．The purpose of the passage is to _____．

A．give an account of a murder case

B．introduce an idea of cognitive interview

C．prove Fisher was an expert in cognitive interview

D．help a witness to recall information in a cognitive interview

68．What is required to recall in a cognitive interview for a witness?

A．The exact time at which a murder took place．

B．The information about the event in the time order．

C．The important things that come to his or her mind．

D．The surroundings and feelings at the time of the event．

69．The key point in a cognitive interview is that______

A．the witness is encouraged to take part in recalling information

B．the interviewer should interrupt the witness from time to time

C．the interview should take place outside the police station

D．the witness should recall details at the scene of the event

70．The underlined word "distorted" in the passage probably means " ____

A．arranged     B．balanced           C．, changed      D．examined

患者瘿肿质软光滑，或大或小，心烦不寐，心悸不宁，多食消瘦，口干咽燥，手颤目突，舌红少苔，脉细数。其证型是

A．心阴亏虚
B．心脾两虚
C．心胆气虚
D．心肝阴虚
E．心肾阴虚

一幅灰度图像，若每个像素有8位像素深度，则最大灰度数目为______。

A．128

B．256

C．512

D．1024

砖墙砌体的砌筑用砂浆宜选用（）。