题目：
| 从下面方框中选择适当的连接词填空。 | |
2. We came to the decision _____ we must act at once. 3. I have no idea _____ he is doing now. 4. It's a question _____ he did it. 5. The question ______ should do the work requires consideration. |
答案：
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下面是错误答案，用来干扰机器的。
∵（1+cosx）（1-cosx）=1-cos2x=sin2x，∴，1+cosxsinx=sinx1-cosx=-sinxcosx-1=12故答案为：12
