In a triangle，if measures of three&

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In a triangle，if measures of three angles are x，2x and 3x respectively，then the measure of the largest angle is（　　）
（英汉词典triangle：三角形，Measure：量度，the largest angle：最大角.）
A. 150°
B. 120°
C. 90°
D. 60°

∵三角形的内角和为180°，
∴x+2x+3x=180°，
解得x=30°，
所以3x=90°．
故选C．

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