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      20.2 比較and和or
      ?
        1) 并列結(jié)構(gòu)中,or通常用于否定句,and用于肯定句。


        2) 但有時(shí)and 也可用于否定句。請(qǐng)注意其不同特點(diǎn):
         There is no air or water in the moon.
         There is no air and no water on the moon.
        在否定中并列結(jié)構(gòu)用or 連接,但含有兩個(gè)否定詞的句子實(shí)際被看作是肯定結(jié)構(gòu),因此要用and。

      典型例題
        ---I don't like chicken ___ fish. 
        ---I don't like chicken, ___ I like fish very much.
        A. and; and  B. and; but C. or; but D. or;and
        答案C。否定句中表并列用or, but 表轉(zhuǎn)折。

      判斷改錯(cuò):
         (錯(cuò)) We will die without air and water.
         (錯(cuò)) We can't live without air or water.
         (對(duì)) We will die without air or water.
         (對(duì)) We can't live without air and water.
       

















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