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The Whites ________ many places of interest since they came to China.
由于轻微创伤使小腿某处皮下青紫并且局部水肿,对这一现象合理的解释是( )
9×(215+112)−25 =____
稻田里的杂草和水稻争夺阳光、养料和水分,体现了生物与生物之间有( )