在初中英语学习中，冠词是一个重要的语法知识点。冠词分为不定冠词（a, an）和定冠词（the），它们在句子中的使用有一定的规则和技巧。为了帮助大家更好地掌握这一知识点，下面提供了一些专项练习题，供大家参考。
一、单项选择
1. There is _______ apple on the table.
A. aB. anC. theD. /
2. She is reading _______ interesting book.
A. aB. anC. theD. /
3. The teacher is writing on _______ blackboard.
A. aB. anC. theD. /
4. He is playing _______ piano.
A. aB. anC. theD. /
5. I see _______ UFO in the sky.
A. aB. anC. theD. /
二、填空
6. This is _______ orange. It's _______ big orange.
7. _______ sun rises in the east.
8. We need _______ umbrella when it rains.
9. _______ moon looks beautiful tonight.
10. Please give me _______ pen on the desk.
三、改错
11. The girl is drawing a picture with a pencil.
（请指出错误并改正）
12. I have a car and my brother has a car too.
（请指出错误并改正）
13. The teacher asked us to write a composition about our school.
（请指出错误并改正）
14. She is reading a interesting storybook.
（请指出错误并改正）
15. The boy is playing the football.
（请指出错误并改正）
通过以上练习题，希望大家能够更加熟练地掌握冠词的使用方法。在日常学习中，多加练习是非常必要的。希望这些题目能对大家有所帮助！