There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to the other.
Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly. This stage of sleep is called REM, which stands for rapid eye movement.
If you have trouble falling asleep, some people recommend breathing very slowly and very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep!
A good title for this passage is ______.
A.Sleep
B.Good Health
C.Play and Study
D.Work and Rest
第1题
先天性心脏病右向左分流的是
A.室间隔缺损
B.主动脉狭窄
C.肺动脉瓣狭窄
D.法洛氏四联症
E.右位心
第2题
属于左向右分流的先天性心脏病是()
A.室间隔缺损
B.主动脉狭窄
C.肺动脉瓣狭窄
D.法洛四联症
E.右位心
第3题
先天性心脏病右向左分流的是
A、室间隔缺损
B、主动脉狭窄
C、肺动脉瓣狭窄
D、法洛四联症
E、右位心
第4题
先天性心脏病左向右分流的是
A.室间隔缺损
B.主动脉狭窄
C.肺动脉瓣狭窄
D.法洛氏四联症
E.右位心
第5题
右向左分流型心脏病
A.室间隔缺损
B.主动脉狭窄
C.肺动脉狭窄
D.房间隔缺损
E.法洛四联症
第6题
属于左向右分流的先天性心脏病是
A.法洛四联症
B.室间隔缺损
C.肺动脉瓣狭窄
D.主动脉缩窄
E.右位心
第7题
属于左向右分流的先天性心脏病是
A.右位心
B.室间隔缺损
C.法洛四联症
D.主动脉缩窄
E.肺动脉瓣狭窄
第8题
属于左向右分流的先天性心脏病是
A.法洛四联症
B.室间隔缺损
C.肺动脉瓣狭窄
D.主动脉缩窄
E.右位心
第9题
属于左向右分流的先天性心脏病是()。
A.法洛四联征
B.室间隔缺损
C.肺动脉瓣狭窄
D.主动脉缩窄
E.右位心
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