选出划线部分发音不同的单词，将其下面的序号写在括号内。
1．Jack and another boy named Jill saw two black birds. ( )
A B C
2．How can you throw the rubbish out of the window? ( )
A B C
3．The runners catch each other and the children watch the match. ( )
A B C
4．After heavy rain, your sweater didn't look clean. ( )
A B C
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