牙髓活力温度测试的中冷刺激是指（）。
A.低于0℃的刺激
B.低于5℃的刺激
C.低于10℃的刺激
D.低于15℃的刺激
E.低于20℃的刺激
参考答案：C
I saw a woman running towards me in the dark. Before I could recognize who she was, she had run back in the direction ________ she had come.
A．of which
B．by which
C．in which
D．from which
《有些人》是一篇回忆性散文。作者回忆了四件事，请给这四件事分别加上小标题。
1．__________________ 2．__________________
3．__________________ 4．__________________
