题目内容
17．-Be careful，_______ you will make mistakes in your exams．-I know that，Mum．One can never be too careful．（ ）
| A． | and | B． | or | C． | nor | D． | but |
分析 --仔细一些，否则考试中你会出错．
--我知道了，妈妈．再怎么仔细也不为过．
解答 答案：B；
根据语境以及上下文，本题考查的是连词的用法．根据设空处前后句的句意"仔细一些"和"考试中你会出错"，可以推断前面一句话的意思是"仔细一些，否则考试中你会出错．"，所以用连词or（否则）表相反的假设；故选B．
点评 比较和分析选项中连词的不用含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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