中学生徐某在网吧认识了社会青年张某。张某教他抽烟、喝酒，后来因为没钱，两人合伙勒索小同学，被公安机关拘留。这启示我们（   ）

一个直角三角尺的两条直角边长是6和8，它的斜边长是10，将这个三角尺绕着它的一边所在的直线旋转一周．（温馨提示：①结果用π表示；②你可能用到其中的一个公式，V_圆柱=πr²h，V_球体=$\frac{4}{3}$πR³，V_圆锥=$\frac{1}{3}$πr²h）．

（1）如果绕着它的斜边所在的直线旋转一周形成的几何体是                                                        ．

（2）如果绕着它的直角边6所在的直线旋转一周形成的几何体的体积是多少？

（3）如果绕着斜边10所在的直线旋转一周形成的几何体的体积与绕着直角边8所在的直线旋转一周形成的几何体的体积哪个大？

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式（最多限填三个单词）填空。

    An ant was walking by a river. She looked at the river and said to herself, “____ nice and cool this water looks! I must drink some of it.” But ____ she was drinking, she slipped(滑倒) into the river.

    Luckily a bird was sitting in the tree. The bird quickly used his mouth ____(cut) a leaf from the tree. He dropped the leaf into the river near the ant.

    The ant climbed onto the leaf, and the wind blew the leaf to the bank. And the ant ____(save).

     “Thank you!”shouted the ant, ____ her low voice. But her voice was ____ low that the bird couldn't hear it.

    After a few days, the bird was building his nest. Suddenly a bird catcher ____(careful) took out his nest(网). He quietly walked towards the branch where the bird was sitting.

    The ant saw this, and ran quickly to bite the ____(man) leg. “Ouch” The pain in his leg made the man drop his nest. The bird heard the noise and ____ (fly) away.

    The bird never knew how the little ant helped. ____ the ant was happy that she was able to do something for the bird.