og11- 67紫色 请教

graceguo98

67 A compelling optical illusion called the illusion of velocity and size makes objects appear to be moving more slowly the larger the objects are. Therefore, a motorist's estimate of the time available for crossing a highway with a small car approaching is bound to be lower  than that it would be with a large truck approaching.

the conclusin above would be more properly drawn if it were made clear that the:
A truck's speed is assumed to be lower that the car's
B truck's speed is assumed to be the same as the car's
C truck's speed is assumed to be higher than the car's
D.mostoris's estimate of time available is assumed to be more accurate with cars approaching than with trucks approaching

E.motorist's estimate of time available is assumed to be more accurate with trucks approaching than with cars approaching 

愣是不明白题意 和答案。

谢谢

graceguo98

题意可以这样理解？“大的物体幻觉上移动的慢。因此，一个司机就估计小车经过高速路的时间比大卡车时间短。”

加上一个假设就是“假设大卡车与小汽车的速度是一样的”不明白为什么加上这个假设B？

为什么A E错？

谢谢

graceguo98

可以这样理解吗？一个司机的幻觉就是小车用的时间比大卡车用的时间短，假设就是“既是小车和大卡车以相同的速度行驶，”所以才有司机的那个幻觉。

ff7250

是不是选B呀，幻觉是物体越大速度越小么，所以只有在同等地速度条件下，幻觉使小车的速度感觉上要大点，所以小车approaching时的available time lower 

tracyvon

选B 其余的选项都不能成为assumption,因为 根据一个视觉错觉的理论，说大的汽车看起来比小的汽车跑的慢， 只有在两个车在相同的速度下行驶，进而发现大汽车的确是看起来感觉跑的慢，才能证实那个视觉错觉的理论， 否则 类似A,E之类的选项，说两者速度不同 或时间不准确  都无法证实那个理论

hansomecd

以下是引用tracyvon在2009-2-18 9:20:00的发言：
选B 其余的选项都不能成为assumption,因为 根据一个视觉错觉的理论，说大的汽车看起来比小的汽车跑的慢， 只有在两个车在相同的速度下行驶，进而发现大汽车的确是看起来感觉跑的慢，才能证实那个视觉错觉的理论， 否则 类似A,E之类的选项，说两者速度不同 或时间不准确  都无法证实那个理论

 正解

 如果速度不同，就称不上是错觉了。

wangziwei

makes objects appear to be moving more slowly the larger the objects are

请问各位大虾，这句话是表达运动的越慢的物体，其本身看起来越大，还是表大的物体其本身看起来运动的越慢呢