Diffusion is the spontaneous spreading of matter caused by the random movement of molecules.

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问题 Diffusion is the spontaneous spreading of matter caused by the random movement of molecules.

选项 A、pattern1ess
B、whirling
C、constant
D、rampant

答案A

解析 random与pattern1ess同义,意为“随便的,胡乱的,任意的”。
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