题目内容：

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

优质解答

dolphins are smart because they can help people同义句 dolphins can help people ,( so /therefore) they are smart前句：海豚聪明是因为他们能帮助人后句：海豚能帮助人,所以/因此他们聪明一个意思a little ,so...