毒物按其化学结构可划分为有机毒物和无机毒物两种。（）
参考答案：对
—I had a really good weekend at my uncle's．
—_________.
A．Oh, that's very nice of you
B．Congratulations
C．It's a pleasure
D．Oh, I'm glad to hear that
我国法律规定，诉讼时效期间届满，当事人丧失（）
A.实体权利
B.胜诉权
C.起诉权
D.反诉权
