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词性转换是语法填空的必考点,每年每套试卷一般考查2~3题。具体考点如下:一、形容词转换成副词修饰动词、形容词、介词短语、不定式短语、从句或全句,用副词作状语。1.(2019年全国Ⅰ卷)It is difficult to figure out a global population of polar bears as much of the range has been 62(poor)studied...解析:修饰动词studied,应用副词poorly。2.(2020年全国Ⅰ卷)Landing on