不定冠词 a 和 an 的用法练习1.He is_ugly man.2.I have _orange.3.There is _elephant in the zoo.4.You are _good student.5.Please take _umbrella.6.I am _student.7.This is _new book.8.I have _useful book.9.He teaches math in_university.10.I bought _MP3 yesterday.11.He is _honest boy.12.I got_ X-ray (x 射线透视) 。13.My father bought me _iphone 5.14.There is_“ u”in the word “hour”,there is_“h”.15.Yao ming is _NBA basketball player.16.Tom had _unusual experience.17.This is_egg.18.I spent _hour doing my homework.