LEFT("12345.6789"，LEN("子串"))的计算结果是（）。
参考答案：1234
解析：
本题考查了字符处理函数的运用，left("12345.6789"，len("字符"))表示从字符串"12345.6789"中取左边的len("字符")个字符，因为len(".字符")等于4，所以left("12345.6789"，len("字符"))就等价于left("12345.6789"，4)，那么left("12345.6789"，len("字符"))计算的结果就是1234。
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| Long, long ago, there lived many mice in an old house. They were free to do 1 . They ate up a lot of food. So 2 owner of the house wanted to stop the mice 3 food. He got a cat. 4 ,some of the mice were killed. One day one of the oldest mice said, " All the mice 5 come to my hole tonight, and we'll decide 6 next about the cat." Each of the mice arrived. They thought 7 and did what they could to find a way to save their 8 .They spoke, sitting face to face, but none of them had an idea. Finally a young mouse stood up and said, " Why 9 tie (拴) a bell 10 the cat's neck? Then, 11 the cat comes close, we will hear the bell and 12 .Then the cat won't 13 catch any more of us." "It 14 good! Who can do it?" the oldest mouse asked. At this very moment the hole was quiet and no one answered. At last he said," It's 15 to say than to do. " | |||
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