题干
He was reading a novel ________ the story reminded him of ________ he had seen during the last war.
A：when, what
B：that, what
C：whose, that
D：while, which
答案(点此获取答案解析）
A
t时间内平均速度为v/2，后
t时间内平均速度为2v，则物体在t时间内平均速度大小是( )
