Hollande is a modest and calm person, while Sarkozy, ，is known to be loud and aggressive(好斗的).
A. by design
B. by contrast
C. by nature
D. by chance
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A. by design
(答案→)B. by contrast
C. by nature
D. by chance
解析：本题考查介词短语辨析。Hollande是一个谦虚和冷静的人,而Sarkozy,相比之下,被认为是吵闹和好斗的。by contrast相比之下；与之相比。