Intelligence test scores follow an approximately normal distribution, (meaning) that most people score near the middle of the di

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问题 Intelligence test scores follow an approximately normal distribution, (meaning) that most people score near the middle of the distribution of scores, (and) scores (drop off) fairly rapidly in frequency as one moves in (either) direction from tile center.

选项 A、meaning
B、and
C、drop off
D、either

答案B

解析
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