快速心律失常中最常见的发生机制是（）
A.儿茶酚胺释放过多
B.折返机制
C.房室旁路
D.心肌细胞内外阳离子的不平衡
E.心肌细胞自律性增高
参考答案：B
看图完成答句，一空一词。
1. How many people can you see in the picture?
I can see two ______ and two ______.
2. Where are these people?
They are in the ______, because there is a ______ on the wall.
3. Where is the plant?
It's ______ the ______.
4. Who has straight long hair?
The second student ______ the ______.
5. Who wears a cap?
The ______ student standing ______ a girl.
脑脊液外观呈毛玻璃样混浊的疾病是（）
A.化脓性脑膜炎
B.结核性脑膜炎
C.病毒性脑膜炎
D.蛛网膜下腔出血
E.流行性乙型脑炎
