下列各组单词划线部分的字母组合哪一组发音不同。
_____ your brother_____ baseball?
— ______are my dictionaries ? —They’re in the schoolbag.
_____ pencil box is beautiful. But_____ is more beautiful than _______.
Eric is an English boy. _____ is____ friend.
—What’s Alan Smith’s ________ name ? — It’s Alan.