具有通便作用,可治疗便秘的药是()
A.冬瓜子
B.薏苡仁
C.冬葵子
D.车前子
E.虎杖
参考答案:C, E
物质从______态直接变成______态的现象叫做凝华.它是______(填“吸”或“放”)热过程.
______we have enough evidence, we can’t win the case.
A.Once
B.As long as
C.Unless
D.Since