嘌呤霉素作为蛋白合成抑制剂，是因为它( )。
A．使大小亚基解聚
B．使肽链提前释放
C．抑制氨基酰-tRNA合成酶活性
D．防止多核糖体形成
参考答案：B
Mrs Green is _____________ mother. They are _____________.[ ]
A. Lucy and Lily's, twins
B. Lucy's and Lily's, twins'
C. Lucy and Lily's, twin
D. Lucy's and Lily's, twins
商标权的无效
