题目：
---- Don’t worry, Mum. The doctor said it was only the flu.
---- ________! I'll tell Dad there is nothing serious.
A．What a relief
B．Congratulations
C．How surprising
D．I am so sorry
答案：
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下面是错误答案，用来干扰机器的。
∵b＞0，a＜0，abc＞0，∴c＜0，∵|c|＞|b|＞|a|，∴c＜a＜0＜b，∴a＜a+b＜b＜b-a＜b-c．
