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完形填空·逻辑关系推断法
►方法概述
在完形填空中,有些空通常需要厘清句子或段落间的逻辑关系才能作答。常见的逻辑关系包括:因果关系、转折关系、并列关系、举例关系、时间关系等。
解题时,先寻找关键词并分析前后内容,判断逻辑关系;再代入验证是否通顺合理;最后结合整体语境,确定答案。
►典型例题
Nana made a small snow ball and rolled it on the ground happily. The ball soon turned into the size of a big snowman’s head. Now Father joined in and together they began rolling another much bigger one for the snowman’s body. When the ball became almost half as tall as Nana’s dad, they rolled it to the middle of the yard. Father helped Nana to put the snowman’s head on its body and made the snowman’s eyes and nose. Finally, they went to get two branches the snowman still needed two arms. They also made sure the branches were strong enough so that birds could stand on them to sing their cheerful songs. Suddenly, Nana seemed to have forgotten something!
()A. before B. because C. until D. unless
【答案】B 解析:本题可采用“逻辑关系推断法”解答。设空前是说,最后他们去拿了两根树枝;设空后是说,雪人还需要两只胳膊。由此可知,设空后是对设空前的解释,再结合备选项可知,前后内容为“因果关系”,应用because引导原因状语从句。故选B。
►方法概述
在完形填空中,有些空通常需要厘清句子或段落间的逻辑关系才能作答。常见的逻辑关系包括:因果关系、转折关系、并列关系、举例关系、时间关系等。
解题时,先寻找关键词并分析前后内容,判断逻辑关系;再代入验证是否通顺合理;最后结合整体语境,确定答案。
►典型例题
Nana made a small snow ball and rolled it on the ground happily. The ball soon turned into the size of a big snowman’s head. Now Father joined in and together they began rolling another much bigger one for the snowman’s body. When the ball became almost half as tall as Nana’s dad, they rolled it to the middle of the yard. Father helped Nana to put the snowman’s head on its body and made the snowman’s eyes and nose. Finally, they went to get two branches the snowman still needed two arms. They also made sure the branches were strong enough so that birds could stand on them to sing their cheerful songs. Suddenly, Nana seemed to have forgotten something!
()A. before B. because C. until D. unless
【答案】B 解析:本题可采用“逻辑关系推断法”解答。设空前是说,最后他们去拿了两根树枝;设空后是说,雪人还需要两只胳膊。由此可知,设空后是对设空前的解释,再结合备选项可知,前后内容为“因果关系”,应用because引导原因状语从句。故选B。
答案
B
解析
【分析】首先明确解题步骤：第一步分析设空前后句子的逻辑关系，设空前是“他们去拿两根树枝”，设空后是“雪人还需要两只胳膊”，后句是前句动作的原因，属于因果关系；第二步辨析选项词义，判断哪个词能体现因果关系；第三步代入验证，确保符合语境。
【解析】设空前提及“他们去拿两根树枝”，设空后说明“雪人还需要两只胳膊”，前后为因果关系，后句是前句的原因。A选项before表时间“在…之前”，C选项until表时间“直到”，D选项unless表条件“除非”，均不符合因果逻辑；B选项because表原因，引导原因状语从句，符合语境，故选B。
【答案】B
【知识点】完形填空、逻辑关系推断
【点评】本题通过逻辑关系推断法解答完形填空，核心是准确识别句子间的因果联系，难度不大，适合初中阶段学生练习。
【难度系数】0.5
【解析】设空前提及“他们去拿两根树枝”，设空后说明“雪人还需要两只胳膊”，前后为因果关系，后句是前句的原因。A选项before表时间“在…之前”，C选项until表时间“直到”，D选项unless表条件“除非”，均不符合因果逻辑；B选项because表原因，引导原因状语从句，符合语境，故选B。
【答案】B
【知识点】完形填空、逻辑关系推断
【点评】本题通过逻辑关系推断法解答完形填空，核心是准确识别句子间的因果联系，难度不大，适合初中阶段学生练习。
【难度系数】0.5
