题目

   Grandma always made you feel she had been waiting to see you and accompany you all day but now the days were gone. She was   41  of suffering from Alzheimer’s disease when I was a kid. I was   42  as all kids are, so I didn’t think   43  about it.    In my family, my grandma is the glue   44  us together. I remember going to my grandparents’ farmhouse every moment I could when I was a kid, where I always enjoyed her   45   . Little did I know, these would be the  __46  of my childhood that I would miss the most.    As I grew up, I   47  my grandma c下图表示枪乌贼离体神经纤维在Na+浓度不同的两种海水中受刺激后的膜电位变化情况。下列描述错误的是 A．在正常海水中受刺激后神经纤维膜内电位由-70mV上升至+30mV B．两种海水中神经纤维的静息电位相同 C．低Na+ 海水中受刺激后神经纤维膜内电位由-70mV上升至-20mV D．正常海水中神经纤维受刺激时，膜内Na+大量外流