题目

The reason ___ he didn’t attend the meeting yesterday was ___ his child had fallen ill. A. that, why   B. why, that   C. why, why    D. that, that 答案：B 解析: 用关系副词why引起定语从句修饰主语the reason;第二空是用that引导表语从句.电流计与神经纤维的连接方式如图1所示，图2是在箭头处施加一定的刺激后，根据电流计指针的变化做出的曲线图。下列有关叙述错误的是 A. 刺激前，图1中a、b两处膜内K+浓度均比膜外高B. 若减小ab间距离为O，则刺激后电流计指针不偏转C. 若将ab中点切断，则刺激后电流计指针只发生一次偏转D. 若将a处电极移至膜外，则电流计指针变化与图2不同