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查询优化可以分为代数优化和物理优化,代数优化比物理优化好。
  • A、正确
  • B、错误
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  •   Nasreddin put two big baskets of grapes on his donkey and went to market. At midday it was very hot, so he stopped in the shade of a big tree. There were several other men there, and all of them had donkeys of grapes too. After their lunch they went to sleep. After some time, Nasreddin began to take grapes out of the other men's baskets and to put them in his.    Suddenly one of the men woke up and saw him. “What are you doing?” he said angrily.    “Oh,” said Nasreddin, “Don't worry about me. I am half mad, and I do a lot of strange things.”    “Oh, really?” said the other man. “Then why don't you sometimes take grapes out of your baskets and put them in somebody else's baskets?”     “You did not understand me”, said Nasreddin. I said that I was half mad, not quite mad.11.Nasreddin went to market_______.                                      A. to sell his donkey         B. to buy something    C. to sell his grapes          D. to find a job 12. Nasreddin stopped______.                                              A. under a big tree           B. near a big tree    C. around a big tree         D. in a big tree 13. As Nasreddin was taking away the other men's grapes one of the men ____.                                             A. pretended not to see him   B. saw him and got angry    C. woke his fellows up             D. came at him 14.Nasreddin said that he did a lot of strange things because___     .   A. he was clever             B. he was quite mad                          C. he was foolish            D. he was half mad 15.In this story Nasreddin was ______.                                                            A. a selfish man   B. a strange man   C. a friendly man   D. a foolish man 大学英语(I)
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