To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction.

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问题 To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction.

选项 A、adaptable
B、movable
C、dependable
D、unpredictable

答案D

解析 本题考查词辨析。本题中random意为“随意的,任意的”, 即无法预测。选项A意为“可适应的”,选项B意为“可移动的”,选项C意为“可靠的”,选项D意为“不可预知的”。选项D语义与替换词最接近,故为正确答案。另外,要注意伴随状语中的三个提示:moving about(四处活动),chaotically(混乱地),without fixed direction(没有固定方向),由此推断出random的具体含义。
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