下列有关人体生命活动调节的叙述中,正确的是( )
A:人醉酒后走路摇晃、站立不稳,说明酒精已经麻醉了脑干
B:人体内的激素含量多,对各项生命活动都具有重要的调节作用
C:神经调节的基本方式是反射,反射的结构基础是反射弧
D:人体内胰岛素分泌不足,会导致血糖浓度低于正常水平
A. I'd like some carrots and fish.
B. I'd like some juice and chicken.
C. I'd like some rice and vegetables.
D. I'd like some beef and bread.
读一读,选一选
____ Is your father here today? A. No, I don't.
____ What does your mother do? B. He's a businessman.
____ Do you want to be a head teacher? C. No. He's in Australia.
____ What does he do? D. She's a head teacher.
下列所示的四个图形中,∠1和∠2是同位角的是( )
据一项专项调查表明,有不少学生有过被校内外不法分子敲诈、勒索、抢劫、搜身、欺侮及其他滋扰的经历。假如你遇到类似的情况,你应该( )