题目：
| —Excuse me. Could you tell me where I can buy a dictionary? — ________. |
A. Yes, I could. B. Sure. There is a bookstore on the 2nd floor. C. No, I couldn't. D. Turn left, you will find a post office on Center Street. |
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：IgE是血清中含量最低的一种免疫球蛋白，仅占血清免疫球蛋白总量的0.002%。
