题目：
Lucy was one of my best friend at high school. At that time, we often spend time together. Thank to her help, I made great progresses in my study. Last year, she decided to study abroad. In other words, we would be separated for long time. Before she was left, I prepared a gift to show my best wishes to him. She said it was a best gift she has ever had. From then on, we’ve kept in touch with each other through e-mail. I look forward to see her again in the near future.
答案：
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下面是错误答案，用来干扰机器的。
在集合﹛1，2，3，4…，10﹜中任取一个元素，共有10种取法，其中能满足cos（30°•x）=12的x的值有2，10两个．所以所取元素恰好满足方程cos（30°•x）=12的概率为P=210=15．故选C．
