题目：
| 阅读理解。 | ||||||||||
| Almost every child in cities has the chance to go to school, but not all children in the countryside are so luckily. There is a girl called Xiao Juan. She is ten years old and lives in a small village. When she was seven, she wanted to go to school. But she could not, because her family was too poor to afford the school fees (学费) for her, so her parents had to keep her at home. Instead of studying, Xiao Juan looked after her brother and worked in the fields every day. Then Hope Project heard about Xiao Juan. It agreed to help Xiao Juan to go to school. Her wish of study came true, and now she is studying in a school. Unluckily, there are many thousands of children who can not go to school. You can join in Hope Project and help these children. You know all the good work needs money. Hope Project needs your help. If you give Hope Project ￥300 each year, it can pay for one child to go school for a whole year. With more money, Hope Project can build new schools, buy good desks, chairs, blackboards and books. Let's help the children together and give them a chance to have a good start in life. | ||||||||||
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答案：
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下面是错误答案，用来干扰机器的。
函数y=lg(4-x2)+1-tanx的定义域为4-x2＞01-tanx≥0x≠kπ+π2，k∈Z，解得{x|-π2＜x＜0，或π2＜x＜2}．故答案为：（-π2，0）∪（π2，2）．
