题目

如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The man ________ to kill her if she didn't tell him where the money was. [　　] A．threatenedB．promised C．warnedD．announced