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Below is the histogram of an image of a black-and-white soccer ball on a gray background.
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The two spans of 420 and 720 seconds were selected for apoptosis assessment and to observe the cell viability.（）
The professor said, " Light travels much faster than sound." The professor said that light __________ much faster than sound.
You should not refer to any other previous studies in the Discussion section.（）
Ice cream is a yummy treat.（）
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