新概念英语mp3听力下载第二册lesson 68

First listen and then answer the question.
Why did Elizabeth tell Nigel that she was going to the dentist?

    I crossed the street to avoid meeting him, but he saw me and came running towards me. It was no use pretending that I had not seen him, so I waved to him. I never enjoy meeting Nigel Dykes. He never has anything to do. No matter how busy you are, he always insists on coming with you. I had to think of a way of preventing him from following me around all morning.
    'Hello, Nigel,' I said. 'Fancy meeting you here!'
    'Hi, Elizabeth,' Nigel answered. 'I was just wondering how to spend the morning -- until I saw you. You're not busy doing anything, are you?'
    'No, not at all,' I answered. 'I'm going to...'
    'Would you mind my coming with you?' he asked, before I had finished speaking.
    'Not at all,' I lied, 'but I'm going to the dentist.'
    'Then I'll come with you,' he answered. 'There's always plenty to read in the waiting room!