有关18F-FDGPET／CT恶性淋巴瘤显像征象的解读，正确的是（）
A.对小淋巴细胞性淋巴瘤的探测优于弥漫性大B细胞性NHL
B.使用粒细胞刺激因子（GSF.后可提高恶性淋巴瘤骨髓浸润探测的准确性
C.治疗后，病灶对18F-FDG摄取减少或消失，而CT示淋巴结无缩小，提示恶性淋巴瘤早期治疗有效
D.对活动性淋巴瘤病灶的诊断价值与CT相当
E.对异常高代谢的淋巴结进行特异性定性诊断
参考答案：C
解析：小淋巴细胞性淋巴瘤的探测可出现假阴性的结果，对小淋巴细胞性淋巴瘤，i8F-FDGPET只能探测到约50%的病灶。应用GSF可出现骨髓活性的普遍增高，进而影响到骨髓浸润与否的判断。对活动性淋巴瘤病灶的诊断价值，18F-FDG优于CT。淋巴结结核、淋巴结炎及淋巴瘤等均可异常摄取18F-FDG，故难以进行特异性定性诊断。恶性淋巴瘤治疗有效的早期阶段，病灶18F-FDG代谢减低或消失，而病灶大小可无变化。综上所述，只有答案C正确，答案A、B、D、E均不正确。
Passage Four
| Despite a cooling of the economy, high technology companies are still crying out for skilled workers. The Information Technology Association of America projects that more than 800 000 technology jobs will go unfilled next year. The lack of qualified workers poses a huge threat to the U. S. economy. The most commonly cited reason for this state of affairs is that the country’s agrarian-age education system, separated from the needs of the business world, fails to prepare students in the primary and secondary grades for twenty-first-century work. Yet an inadequate and outmoded education system is only part of the problem. A less tangible but equally powerful cause is an antique classification system that divides the workforce into two camps: white-collar knowledge workers and blue-collar manual laborers. Blue-collar workers emerged in the United States during the Industrial Age as work migrated from farms to factories. White-collar office workers became a significant class in the twentieth century, outnumbering their blue-collar brethren by mid-century. But the white or blue paradigm has clearly outlived its utility. Corporations increasingly require a new layer of knowledge worker: a highly skilled multi-disciplinarian who combines the mind of the white-collar worker with the hands of the blue-collar employee. Armed with a solid grounding in mathematics and science (physics, chemistry and biology), these "gold-collar" workers--so named for their contributions to their companies and to the economy, as well as for their personal earning ability—apply that knowledge to technology. Of course, the gold-collar worker already exists in a wide range of jobs across a wide range of businesses: think of the maintenance technician who tests and repairs aircraft systems at American Airlines; the network administrator who manages systems and network operations at P＆G; the advanced-manufacturing technician at Intel. But until American business recognizes these people as a new class of worker, one whose collar is neither blue nor white, demands that schools do a better job of preparing employees for the twenty-first-century workforce will be futile. Certainly, polytechnic high schools, colleges, and universities have made heroic efforts to teach workers new skills. But because many people see these initiatives as primarily training blue-collar workers, adequate funds are not invested in such programs, leaving them short of state-of-the-art tools and experienced teachers. And because gold-collar workers need to constantly update their skills to stay current with emerging technology, learning must be a continuous process, one that is funded by companies as well as by taxpayers. |
It can be inferred that the gold-collar workers differ from white-collar and blue-collar workers in that they ______.
A．wear gold-collar working clothes when they are on duty
B．do better in combining their contributions and earning abilities
C．grasp the knowledge and engage in labor work as well
D．apply the arts knowledge to technology