单选题Nothing is more important

单选题 Nothing is more important than health, so it is unwise to build up our business ________ our health.A.at the mercy ofB.at the expense ofC.in face ofD.in relation to

B解析此题是词组辨析：at the mercy of 任由…支配，.at the expense of以…为代价 in face of面临 in relation to和…有关，根据句意：没有什么比健康重要，以健康为代价扩大生意是不明智的。所以选B。

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