患者李某，心腹卒痛，突然昏倒，牙关紧闭，不省人事，苔白脉迟。治宜选用：（）
A.紫雪
B.至宝丹
C.苏合香丸
D.安宫牛黄丸
E.回阳救急汤
参考答案：C
等腰三角形的两边长分别是3和7，则其周长为______．
“He hasn't got any hobbies——_______you call playing games on computer a hobby.” Mr. Lin said.
A． If
B． Unless
C． When
D． Since
