在沥青用量与马歇尔稳定度试验指标关系图中，呈左高右低曲线的图形是沥青用量与（）的关系图。
A.稳定度
B.饱和度
C.空隙率
D.流值
参考答案：C
— According to my grandma, it is a good idea to eat chicken soup when you have a cold.
— _____, scientists agree with her.[ ]
A. Sooner or later
B. Once in a while
C. To be exact
D. Believe it or not
Witnesses also say they saw Justin ____ towards his house at 10.45 p.m.
A．walked
B．walking
C．to walk
D．to be walking
