题目

—I believe we've met somewhere before.—No, _________. A. it isn't the same B. it can't be true C. I don't think so D. I'd rather not 答案：C 解析: 对话双方一方表示自己的猜测，要求对方予以证实。可以把I believe we've met somewhere before.理解为 Do you believe we've met somewhere before?故答语应表明自己的意见。联系语境是做好日常交际用语题的关键。  16．已知函数f（x）=$\left\{\begin{array}{l}{\sqrt{-x}+a，x≤0}\\{（x-1）^{3}+1，x＞0}\end{array}$，且?x0∈[2，+∞）使得f（-x0）=f（x0），若对任意的x∈R，f（x）＞b恒成立，则实数b的取值范围为（　　）A．（-∞，0）B．（-∞，0]C．（-∞，a）D．（-∞，a]