下列不属于繁殖行为的是（　　）

某中学以“我最喜爱的书籍”为主题，对学生最喜爱的书籍类型进行随机抽样调查，收集整理数据后，给出如下两幅未完成的统计图，请根据图①和图②所提供的信息，解答下列问题：

（1）在这次抽样查中，一共调查了多少名学生？

（2）把折线统计图①补充完整；

（3）求出扇形统计图②中体育部分所对应的圆心角的度数；

（4）如果这所中学共有学生1800名，那么你估计最喜爱科普类书籍的学生人数．

针对探究“光对鼠妇生活的影响”的实验回答下列问题：

多项式x³+bx²+cx+d适合于下列三条件：

（1）被x﹣1整除；

（2）被x﹣3除时余2；

（3）被x+2除时与被x﹣2除时的余数相等，求b，c，d的值．

    One day a famous teacher was walking with his student. On the way, they saw a lake. They stopped and the teacher told the student, “I'm thirsty. Get me some water from that lake.”

    Just when the student reached the lake, a cow was walking in the lake. So the water became very dirty. He thought “I can't give the dirty water to my teacher!”

    He came back and told the teacher, “The water is very dirty. We can't drink it.” After about half an hour, the teacher asked the student to get some water again. So he went back to the lake.

    But the lake was still dirty. So he told the teacher the same thing. After some time, the teacher asked him to go back again. But this time, he found the water was clear. The mud in the water came to the bottom. So he got some water.

    The teacher looked at the water and said to him, “You did nothing to make the water clear. You just let it be… Your mind is also like that! When it is bothered, just let it be. Give it some time.”