皮皮学，免费搜题
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【单选题】
LD50 表示的是A.
半数有效剂量
B.
半数有效浓度
C.
半数致死剂量
D.
半数致死浓度
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】I really feel like ______a talk with Daniel about her lessons but don’t know how to pick it up.
A.
to have
B.
having had
C.
to having
D.
Having
【单选题】—How was your holiday? —______. [ ]
A.
Not good at all
B.
Not bad
C.
I don't want to talk about it
D.
Don't mention it
【简答题】When we talk about how agers are getting worse and worse now, most young people don’t agree. agers always say they are growing up. They can have part-time jobs. And they can even drive a car. ...
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