问题
选择题
Nothing is more important than health, so it is unwise to build up our business ________ our health.
A．at the mercy of
B．at the expense of
C．in face of
D．in relation to
答案
答案：B
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。