完形填空。阅读下面短文，掌握其大意，然后从各题所给的A、B、C和D项中，选出最佳选项。
When I first entered university, my aunt, who is an English professor, gave me a new English dictionary. I was _1___to see that it was an English dictionary, also known as a monolingual dictionary._2__it was a dictionary intended for non—native learners, none of my classmates had one __3__, to be honest, I found it extremely __4_ to use at first. I would look up words in the dictionary and _5__ not fully understand the meaning. I was used to the __6__ bilingual dictionaries, in which the words are _7__ both in English and Chinese. I really wondered why my aunt __8_ to make things so difficult for me. Now, after studying English at university for three years, I _9_ that monolingual dictionaries are __10_ in learning a foreign language As I found out, there is __11 often no perfect equivalence(对应)between two _12___ in two language. My aunt even goes so far as to 13__ that a Chinese "equivalent" can never give you the __14__ meaning of a word in English! ___15 , she insisted that I read the definition(定 义) of a world in a monolingual dictionary __16___ I wanted to get a better understanding of its meaning. ____17__, I have come to see what she meant. Using a monolingual dictionary for learners has helped me in another important way.
