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【单选题】
有关青霉素的说法中不正确的是( )。A.
青霉素G是一种谱抗生素
B.
青霉素的结构骨干中均有青霉酸
C.
青霉素在体内经酸性水解后，得到青霉氨基酸
D.
青霉素在使用前不需要做皮肤敏感试验
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举一反三
【单选题】Go ____ the gate and you' 11 find the entrance ____ the park ____ the other side.
A.
through; to; on
B.
along ;of; on
C.
down; to; at
D.
up; of; by
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【简答题】He was dismissed by his boss not because he was inexperienced but because he was not enough careful.
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