紫雪丹的功用是
A．清热开窍，熄风止痉
B．清热解毒，开窍醒神
C．化浊开窍，清热解毒
D．清心凉血，开窍醒神
E．以上均非
参考答案：A
The water is free. You can drink _________ possible. [ ]
A. as much as
B. as many as
C. as more as
D. as most as
与流入肾脏的血液相比，从肾脏流出的血液里含量显著增多的是（ ）
A．尿素
B．氧气
C．二氧化碳
D．蛋白质
