三年级上册英语 期末常考易错题 一、a/an的用法。(单项选择) ( A )1. [浙江省慈溪市]Act like an ________. A. elephant B. tiger C. monkey ( B )2. Look! I have an ________. A. pencil box B. eraser C. bag ( B )3. I have an ________. A. blue ruler B. orange book C. white eraser ( A )4. I have ________ brown eraser.