【題目】對一個女孩來說，在野外對動物進行三年的研究是很困難的。
It's hard for a girl to on animals in the wild for three years．

【答案】do；research
【解析】It's hard for a girl. 對一個女孩來說很難。on animals在動物方面， in the wild for three years在野外三年。根據(jù)英文句意可知所缺中文應為“研究” �！白鲅芯俊钡挠⑽谋磉_結(jié)構(gòu)為“do research ”。句型“It's+adj.+for sb.+to do sth.”表示做某事對某人來說是很adj；to do是動詞不定式。所以答案是：①do ②research

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