问题描述：
dolphins are smart because they can help people 同义句 dolphins can help people ,() they are smart
i don't like math because it's a little difficult for me（同义句）
math is () () difficult for me ,() i don't like it
i don't like math because it's a little difficult for me（同义句）
math is () () difficult for me ,() i don't like it
问题解答：
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