OG CR 求解

CathyGYM · 发表于 2017-9-29 11:07:05

Which of the following most logically completes the argument?

A photograph of the night sky was taken with the camera shutter open for an extended period. The normal motion of stars across the sky caused the images of the stars in the photograph to appear as streaks. However, one bright spot was not streaked. Even if the spot were caused, as astronomers believe, by a celestial object, that object could still have been moving across the sky during the time the shutter was open, since __________.

Athe spot was not the brightest object in the photograph 分析该选项
Bthe photograph contains many streaks that astronomers can identify as caused by noncelestial objects 分析该选项
Cstars in the night sky do not appear to shift position relative to each other 分析该选项
Dthe spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open 分析该选项
Eif the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects 分析该选项

OA: D 没太想明白，求教！

tsui999 · 发表于 2017-9-30 22:47:55

1.题目：大致意思是延时摄像（我猜）拍摄的星星运动轨迹是条线，但是相片里有个亮点（天文学者相信这个亮点是一个天体,言外之意它应该有运动轨迹排除了拍摄曝光啥的出现亮点的可能性）的轨迹不是线性的，结论是这个物体在拍摄中是有运动的，找原因为什么它运动了却没拍摄出来是线性的。
2.问题：在选项中找出这个原因是什么
4.选项：D的意思解释这个亮点因为某个物体导致发光了但是持续时间只有那么一下下，不过还是被相机捕捉下来的，意思就是这个点是运动的，原本就是暗点只是被刺激了下亮灯了一会，就被相机拍下来了，所以相机拍出的是一个亮点而不是线条。

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