单选题
_______ in the color of sea water from blue to green seem to be caused by high or low concentration of salt.
【正确答案】
A
【答案解析】[译文]海水从蓝到绿的变化看来是由盐浓度的高低导致的。 [解析]名词辨义。variation意为“变化,变异”,如:a variation of ten pounds in weight(在重量上十磅的变化量);evaporation意为“蒸发”,如:air evaporation(空气中蒸发);exploration意为“探险,探测”.如:Arctic exploration(北极探险);explosion意为“爆发,爆炸”,如:explosions of laughter(哄堂大笑)。