生产“红牛肉”的育肥方式为（）。
A、犊牛的育肥
B、直线育肥
C、架子牛的育肥
D、成年牛育肥
参考答案：A
Wu Juping was presented with her award at a ceremony which ______ the bravery of the woman
who had saved a baby falling from the tenth floor . [ ]
A. recognized
B. witnessed
C. approved
D. distinguished
在奋乃静的化学结构中引入氟原子可发生以下哪种变化（）
A.增加了位阻
B.增加了脂溶性
C.增加了水溶性
D.可影响分子间的电荷分布和脂溶性及药物作用时间
E.改变了溶解度
