下面开始正文：
　　1. [比大小] 一个数列，定义为a(n)=5/(2^n). 数值A:第一项至第十五项的和; 数值B: 5。
　　答案：5比较大。懂了就懂了，不懂也能按计算器。
　　2. [不定项选择] 有7个包裹需要被运送. These packages can be put into Box 1, 2 or 3. To be able to ship, each box is required to contain at least two packages. 问下面哪些描述正确。
　　A. There are exactly three packages in one box.
　　B. Each box must contain more than 3 packages in one box.
　　C. There must be a box with odd numbers of packages.
　　答案：AC。