问题
单项选择题
“五条禁令”自( )起施行。原来规定与“五条禁令”不一致的，以“五条禁令”为准。
A．2003年1月1日
B．2003年1月22日
C．2003年2月1日
D．2003年3月1日
答案
参考答案：C
解析：“五条禁令”自2003年2月1日起施行。原来规定与“五条禁令”不一致的，以“五条禁令”为准。
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“五条禁令”自( )起施行。原来规定与“五条禁令”不一致的，以“五条禁令”为准。
A．2003年1月1日
B．2003年1月22日
C．2003年2月1日
D．2003年3月1日
参考答案：C
解析：“五条禁令”自2003年2月1日起施行。原来规定与“五条禁令”不一致的，以“五条禁令”为准。
| 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. |
On the part of an average sleeper, there______of sleep in cycles.
A．is one stage
B．are two stages
C．are six stages
D．are four stages