皮皮学，免费搜题
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【单选题】
治疗指数最大的药物是（）A.
A药半数致死量（LD 50 ）=500mg，半数有效量（ED 50 ）=100mg
B.
B药LD 50 =100mg，ED 50 =50mg
C.
C药LD 50 =50mg，ED 50 =5mg
D.
D药LD 50 =500mg，ED 50 =25mg
E.
E药LD 50 =100mg，ED 50 =50mg
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A.
攀枝花
B.
成都
C.
西昌
D.
大理
E.
丽江
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A.
115
B.
123
C.
106
D.
152
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A.
such nice a girl
B.
such a nice girl
C.
so a nice girl
D.
a very nice girl
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A.
borrow
B.
use
C.
keep
D.
make
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