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不定冠词a和an的用法练习1.Heis____uglyman.2.Ihave_____orange.3.Thereis____elephantinthezoo.4.Youare____goodstudent.5.Pleasetake____umbrella.6.Iam____student.7.Thisis___newbook.8.Ihave___usefulbook.9.Heteachesmathin___university.10.Ibought___MP3yesterday.11.Heis____honestboy.12.Igot___X-ray(x射线透视)。13.Myfatherboughtme___iphone5.14.Thereis___“u”intheword“hour”,thereis____“h”.15.Yaomingis____NBAbasketballplayer.16.Tomhad____unusualexperience.17.Thisis___egg.18.Ispent___hourdoingmyhomework.