【导学过程】
用a\an填空（a用于辅音音素开头的词前，an用于元音音素开头的词前。）
___ lion ___bird ___orange
___“L” ___giraffe ___ old man
___ “u” ___umbrella ___ interesting book
___ hour ___ honest boy
用a\an\the完成句子（首次提到某人或某物时，在前面用不定冠词a/an。
当我们再次提到某人或某物时，我们在前面加定冠词“the”。）
1.Once there lived ___ old man .___ old man had 3 sons.
2. Is there ___ library near here?-- Yes.____ library is just next to ____post office.
