土地使用权出让具有( )的特点。
A．平等
B．自愿
C．无偿
D．有限期
E．公开
参考答案：A,B,E
首次使用氧气枕时，将橡胶枕内反复用水冲洗和揉搓，其目的是防止发生
A．食管炎
B．肺炎
C．支气管炎
D．鼻炎
E．咽炎
Maybe if I _______ literature, but not science then, I would be able to give you more advice now.
A．studied
B．would study
C．had studied
D．was studying
