题目选项分析

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\underline{AB}.

【选项】the spot was not the brightest object in the

photograph