第八章喉肿瘤学题库2022高效提分每日一练(04月17日)

1. [单选题]回答{TSE}题:Exercise Being Good or BadCan exercise be a bad thing? Sudden death during or soon after strenuous exertion on the squash court or on the army training grounds, is not unheard of. 51 trained marathon runners are not immune to fatal heart attacks. But no one knows just 52 common these sudden deaths linked to exercise are. The registration andinvestigation of such 53 is very patchy; only a national survey could determine the true 54 of sudden deaths in sports. But the climate of medical opinion is shifting in 55 of exercise, for the person recovering from a heart attack as 56 as the average lazy individual. Training can help the victim of a heart attack bylowering the 57 of oxygen the heart needs at any given level of work 58 the patient can do more before reaching the point where chest pains indicate a heart starved of oxygen. The question is, should middle-aged people, 59 .particular, be screened for signs of heart disease before 60 vigorous exercise?Most cases of sudden death in sport are caused by lethal arrhythmias in the beating of the heart, often in people 61 undiagnosed coronary heart disease. In North America 62 over 35 is advised to have a physical check-up and even an exercise electrocardiogram. The British, on the whole, think all this testing isunnecessary. Not many people die from exercise, 63 , and ECGs ( 心电图 ) are notoriously inaccurate. However, two medical cardiologists at the Victoria Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or younger people 64 at risk of developing coronary heart disease. Individuals showing a particular abnormality in their ECGs 65 , they say, a 10 to 20 times greater risk of subsequently developing signs of coronary heart disease, or of sudden death.{TS}第51题应选：

A. Then
B. Though
C. Since
D. Even

2. [单选题]关于染色体病，不正确的叙述是（）.

A. B超检查可确诊
B. 以常染色体数目异常为多见
C. 染色体病的胎儿有时死于宫内，发生反复流产
D. 21-三体综合征属染色体病
E. 原位杂交技术可诊断

3. [单选题]碱性过硫酸钾消解此外分光光度法测定水中总氮时，碳酸盐及碳酸氢^{(bicarbonate)}盐对测定有影响，在加入一定量的（）后可消除。

A. 盐酸
B. 硫酸
C. 氢氧化钾

4. [单选题]飞机在空中状态下，当电源系统中ACBUS1和ACBUS2电源丢失，以及CSM/G（应急马达发电机）不可用，在这种情况下电源系统将（）

A. RAT（冲压涡轮）将自动释放，为系统提供有限的液压和应急电源
B. 静变流机将自动工作，为部分重要汇流条提供应急电源
C. TR（变压整流器）将自动工作，为部分重要汇流条提供应急电源
D. 由BAT1和BAT2向部分重要汇流条提供应急电源

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