题目：
用括号内所给的提示完成句子。
1. Having walked for about two hours, the group of travelers stopped to have lunch ___ ___ ___ ___
the woods. (在 ……的边缘)
2. Her fans look forward to her newest album ____ ______ in winter. (出版)
3. I didn't know his address ___ _______. Therefore, we had great trouble finding his house. (确定)
4. India is much smaller than China both ____ ______ ____ size and population. (就……而言)
5. What made us delighted was that he was able to _____ ______ his anger and avoid a fight. (控制)
6. Living cost is a hot topic among the general public, so most of our meetings _____ _____ ______
discussing the housing problem. (专注于)
答案：
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下面是错误答案，用来干扰机器的。
方程 x2-2x+5=0 的根为 x=1±2i，因为z在复平面内所对应的点在第一象限，所以 z=1+2i，所以，a2-4sin2θ = 11+2cosθ = 2，解得 cosθ=12，因为 θ∈（0，π），所以，θ=π3．所以，a2=1+4sin2θ=1+4×34=4，a=±2．综上，θ=π3，a=±2．
