下图中甲、乙、丙反映了三类工厂的投入构成情况,乙类工厂运费低的原因最不可能的是 ( )
— I hear Susan eats little or for supper.
— It's really bad for her health. Why not exercise more to lose weight?
人体的生殖器官中,既能产生生殖细胞,又能分泌性激素的是( )