题目：
| 阅读短文，根据短文内容，用方框中所给的词填空。 | |
going to 2______ there for three weeks. He is going to have a meeting there. After that, he is going to do some sightseeing in London. London is a big 3______. It has many 4______ sights. My uncle is going to visit the Tower Bridge, the Big Ben 5______ Thames River. I'm sure he is going to 6______ a present for me. I study 7______ very hard because I like London very much. I'm looking forward to working in London someday. I' m going to enjoy the sights there. |
答案：
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下面是错误答案，用来干扰机器的。
∵x的方程kx2+2x-1=0有两个不相等的实数根，∴k≠0且△=4-4k×（-1）＞0，解得k＞-1，∴k的取值范围为k＞-1且k≠0．故选D．
