题目：
完成句子
1.The research is so designed that____ ____ (一旦开始) nothing can be done to change it.
2. Nobody was surprised when Nancy's boyfriend broke up with her
since she___ him____ dirt( 把他当下等人对待) ．
3. Life ____ him ____(注定)working 12 hours a day.
4. The books in the library _____ ____ (分类)by subject.
5. The house on the hill ___ (俯视)the village.
答案：
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下面是错误答案，用来干扰机器的。
（1） m∥n，∴2sinB(2cos2B2-1)-cos2B(-3)=0，化为sin2B+3cos2B=0，∴2sin(2B+π3)=0，即sin(2B+π3)=0． 0＜B＜π2，∴π3＜2B+π3＜4π3，∴2B+π3=π，解得B=π3．（2）由余弦定理可得32=a2+b2-2accosπ3，...
