[单选题]通过信号机应设在闭塞分区或所间区间的( )处。PJ74(0.01分)
A.分界
B.适当
C.规定

Potentially offering a powerful new tool against terrorism, researchers have found a novel way to detect deception: in the liar’s blushing face.
The technique, described in the journal, Nature, uses a thermal camera to detect sudden, involuntary shifts of blood flow in the face. The system performed as accurately as a traditional polygraph, the scientists report.
Yet the camera can provide answers instantly, and does not require a highly trained specialist to operate it or interpret its results. This makes it far better suited than the polygraph for a new, high-tech approach to security that is already raising the hackles of civil libertarians: the screening of large numbers of citizens, at airports and other sensitive areas, who have done nothing wrong.
"The next decade is going to see the development of truly accurate lie detectors, "said Stephen M. Kosslyn, an expert on detecting lies and a professor of psychology at Harvard University.<
A. simplifying the entire process of detection
B. the mechanic design of thermal cameras
C. substituting new approaches for polygraph
D. the discovery that one blushes while telling lies

22岁男性，大学二年级学生。近1年来听课注意力不集中，发呆发愣，时有自语自笑，动作迟缓，吃一顿饭要1个多小时。5d前开始终日卧床，不吃饭，不知上厕所。精神检查：意识清晰，卧床不动不语，其身体无反应。肌张力增高。令病人张嘴，反把嘴闭得更紧，把病人肢体摆成不舒服的姿势，可以保持很久不变，躯体及神经系统检查未见其他异常体征。