One upon a time, there were two fishermen who were good at fishing. One day, they went to a lake to1 . One of them 2 fishing alone by himself 3the other was an outgoing person who loved to 4 friends with different people.

    When the second fisherman found that some tourists at the lake couldn't catch any fish. He said to them“I will teach you how to do that. If you catch 10 fish, give me one. If you don't get 10,you 5 give me anything.”

    They felt like old friends at the first sight. Both sides come to a(n)6 immediately. After he finished teaching a group, he went to teach another, and 7 taught them some fishing skills.He asked one for every 10 fish the tourists 8 .

    At the 9 of the day, the fisherman who kindly helped others received a(n)10 basket of fish, and also got to know a large group of new friends. At the same time, he was respected（尊重）as a(n)11 .

    However,12 fisherman didn't have much fun. When the others circled around his camp, he became even more 13 . After fishing for a whole day alone, he looked into the 14 basket,and found he had far fewer fish than his friend.

    If we 15 others succeed, we get both success and friends.

在△ABC中，a，b，c分别为内角A，B，C的对边，3cosA﹣cos（B+C）=1，a=$\sqrt{15}$，B=$\frac{\mathrm{\pi }}{4}$，则b等于（　　）

当血液流经肾小球时，除____ 和____ 外，血液中其他成分都通过肾小球滤过到肾小囊内，形成原尿；原尿流经肾小管时，全部的____、大部分水和部分无机盐被重新吸收回血液，剩下的便是尿液．

下列各句中，划线的成语使用恰当的一项是(    )