一级电力供应预警信号应缺额为（）。
A.20%以上
B.10%～20%
C.5%～10%
D.5%以下
参考答案：A
大量咯血不见于（）
A.空洞型肺结核
B.慢性肺脓肿
C.慢性支气管炎
D.支原体肺炎
E.支气管扩张症
It is _______ it was yesterday.
A．as beautiful day as
B．as a beautiful day as
C．as beautiful a day as
D．beautiful as a day as
