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Choose the correct letter, A, B or C. A TFN is a number used（）

A. exclusively for tax administration.
B. exclusively by individual tax payers.
C. for managing several government services.

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Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage—a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far. According to the first paragraph, the atmosphere is essential to man in that ______.

A. it protects him against the harmful rays from space
B. it provides sufficient light for plant growth
C. it supplies the heat necessary for human survival
D. it screens off the falling meteors

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患者，男，38岁。出现下肢麻木、发凉，间歇性跛行8年，有20年吸烟史。近来病情发展，持续疼痛，夜间尤甚，右下肢肌肉萎缩，右足背动脉搏动消失，诊断为血栓闭塞性脉管炎。不考虑该患者为下肢动脉硬化性闭塞的主要依据是

A. 患者年轻，病史长
B. 间歇性跛行
C. 足背动脉搏动消失
D. 夜间疼痛重

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案例分析题患者，女，28岁。3个月来乏力，1周来发热伴皮肤紫癜和口腔颊黏膜血疱，浅表淋巴结及肝脾均不大，胸骨无压痛。化验：血Hb 65 g/L，RBC 2.2×1012/L，Ret 0.2%，WBC 2.4×109/L，分类：N 24%， L 70%，M 6%，Plt 10×109/L，胸部X线片检查示右下肺炎症。为确定诊断，首选的检查是（）

A. 血清铁和铁蛋白
B. 血清叶酸和维生素B12
C. 骨髓穿刺
D. 骨髓活检

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患者，男，38岁。出现下肢麻木、发凉，间歇性跛行8年，有20年吸烟史。近来病情发展，持续疼痛，夜间尤甚，右下肢肌肉萎缩，右足背动脉搏动消失，诊断为血栓闭塞性脉管炎。对该患者最适宜的治疗是

A. 使用血管扩张剂
B. 腰交感神经切除术
C. 截肢术
D. 溶栓疗法

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Choose the correct letter, A, B or C. A TFN is a number used（）

A. exclusively for tax administration. B. exclusively by individual tax payers. C. for managing several government services.

患者，男，38岁。出现下肢麻木、发凉，间歇性跛行8年，有20年吸烟史。近来病情发展，持续疼痛，夜间尤甚，右下肢肌肉萎缩，右足背动脉搏动消失，诊断为血栓闭塞性脉管炎。 对该患者最适宜的治疗是

A. exclusively for tax administration.
B. exclusively by individual tax payers.
C. for managing several government services.

患者，男，38岁。出现下肢麻木、发凉，间歇性跛行8年，有20年吸烟史。近来病情发展，持续疼痛，夜间尤甚，右下肢肌肉萎缩，右足背动脉搏动消失，诊断为血栓闭塞性脉管炎。对该患者最适宜的治疗是