问题
单项选择题 A1/A2型题
目前认为艾滋病的传播途径，不包括（）
A.性传播
B.输血及血制品
C.静脉滥用毒品者共用注射器
D.母婴垂直传播
E.昆虫叮咬传播
答案
参考答案：E
解析：HIV存在于感染者的血液及各种体液中，因此输血、血制品或接触含HIV的体液均可能被感染。但HIV在昆虫体内不能存活，所以昆虫叮咬不会传播艾滋病。
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目前认为艾滋病的传播途径，不包括（）
A.性传播
B.输血及血制品
C.静脉滥用毒品者共用注射器
D.母婴垂直传播
E.昆虫叮咬传播
参考答案：E
解析：HIV存在于感染者的血液及各种体液中，因此输血、血制品或接触含HIV的体液均可能被感染。但HIV在昆虫体内不能存活，所以昆虫叮咬不会传播艾滋病。
| When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40-60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm. You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, your activity cycle will increase slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids. This period of Rapid Eye Movements lasts for 8-15 minutes and is called REM sleep. During both light and deep sleep, the muscles in your body are relaxed but capable of movement. As you slip into REM sleep, a very odd thing occurs -- most of the voluntary muscles in your body become paralyzed. Although your brain shows very rapid bursts of neural activity during REM sleep, your body is incapable of moving. REM sleep is accompanied by extensive muscular inhibition. |
You will fall into the fourth stage of sleep______.
A．about 80 minutes after you fall into slumber
B．some 10 minutes after your fall into REM sleep
C．about 40 minutes after you lose consciousness
D．some 30 minutes after your brain waves slow