Other people feel sure that the present trend is towards too little sleep. To quote one medical opinion, "Thousands of people drift through life suffering from the effects of too little sleep; the reason is not that they can't sleep. Like advancing colonists, we do seem to be grasping ever more of the land of sleep for our waking needs, pushing the boundary back and reaching, apparently, for a point in our evolution where we will sleep no more. This in itself, of course, need not be a bad thing. What could be disastrous, however, is that we should press too quickly towards this goal, sacrificing sleep only to gain more time in which to jeopardize our civilization by actions and decisions made weak by fatigue.
Then, to complete the picture, there are those who believe that most people are persuaded to sleep too much. Dr. H. Roberts, writing in Every Man in Health, asserts it may safely be stated also. It would be a pity to retard our development by holding back those people who are gifted enough to work and play well with less than the average amount of sleep, if indeed it does them no harm. If one of the trends of evolution is that more of the life span is to be spent in gainful waking activity, then surely these people are in the van of this advance.
The author seems to indicate that ______.
A.there are many controversial issues like the right amount of sleep
B.among many issues the right amount of sleep is the least controversial
C.people are now moving towards solving many controversial issues
D.the right amount of sleep is a topic of much controversy among doctors
第1题
血小板无力症
A.瑞斯托霉素诱导的血小板无聚集
B.GPⅡb/Ⅲa缺乏
C.血小板相关补体3增高
D.血小板黏附率增高
E.ADP诱导的血小板聚集正常
第2题
巨大血小板综合征
A.瑞斯托霉素诱导的血小板无聚集
B.GPⅡb/Ⅲa缺乏
C.血小板相关补体3增高
D.血小板黏附率增高
E.ADP诱导的血小板聚集正常
第4题
瑞斯托霉素诱导的血小板凝集和ADP诱导的血小板聚集所不同的是
A.血小板不被激活
B.vWF不参与
C.GPⅡb/Ⅲa起主要作用
D.与GP I b/Ⅸ/V复合物无关
E.与血浆纤维蛋白原浓度相关
第5题
瑞斯托霉素诱导的血小板凝集和ADP诱导的血小板聚集所不同的是
A、血小板不被激活
B、vWF不参与
C、GPⅡb/Ⅲa起主要作用
D、与GPⅠb/Ⅸ/Ⅴ复合物无关
E、与血浆纤维蛋白原浓度相关
第6题
哪项符合巨血小板综合征
A、ADP诱导血小板不聚集
B、胶原诱导血小板不聚集
C、肾上腺素诱导血小板不聚集
D、花生四烯酸诱导血小板不聚集
E、瑞斯托霉素诱导血小板不聚集
第7题
下列哪项不符合血小板无力症
A、ADP诱导血小板不聚集
B、花生四烯酸诱导血小板不聚集
C、胶原诱导血小板不聚集
D、瑞斯托霉素诱导血小板不聚集
E、出血时间延长
第9题
在致血小板聚集诱导剂中,活性作用最强的是
A、ADP
B、Ⅱa
C、PAF
D、肾上腺素
E、瑞斯托霉素
第10题
在下列致血小板聚集诱导剂中,活性最强的是 ()
A、ADP
B、Ⅱa
C、PAF
D、肾上腺素
E、瑞斯托霉素
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