题目

第二性征的出现主要与何种激素的作用直接有关        A、生长激素                                         B、性激素           C、甲状腺激素                                       D、促性腺激素 答案：B() 12. (中考•襄阳) 一When will you hand in your book report?—Sorry,Fm not sure. I writing it yet.   A. didn't finish     B. don't finish   C. hadn't finished   D. haven't finished