题目内容

It's time to ______ now.

A. go to school
B. go to bed
C. play games

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是糖蛋白激素，决定与性腺效应细胞受体结合的特异性

只有相负荷时，等效三相负荷取最大相负荷的3倍。()

A. 正确
B. 错误

卵泡膜细胞有其受体，结合后使细胞内胆固醇形成睾酮和雄烯二醇

This question is not ______ that one.

A. so difficult than
B. so difficult as
C. as difficult than