以直角三角形的三边为边长分别向外作正方形，已知其中两个正方形的面积分别为20和16，则第三个正方形的边长为（       ）

一位社会学家说：“学会做人，学会辨别是非善恶，比学习专业知识显得更为重要，一个‘德盲’远比一个文盲对社会更具负面效应”。这告诉我们（  ）

完形填空

    Mr. Smith lived in a big city. When he retired(退休), he bought a small 1in a village near the sea. He2it and hoped to live a quiet life in this house.

    But to his great surprise, many visitors came to see his house in summer holidays, for it was the most 3building in the village. From morning to night there were 4outside the house. They kept looking 5the rooms through the windows and many of them even went into Mr. Smith's garden. This was too much for Mr. Smith. He decided to ask the visitors to 6. So he put a notice (告示) on the window. The notice said, “If you want7it, come in and look round. Price: twenty dollars.” Mr. Smith was sure that the visitors could8coming, but he was wrong. More and more visitors came and Mr. Smith had to 9every day taking them around his house.“I came here to 10not to work as a guide,” he said angrily. In the end, he sold the house and moved away.

下列句子中没有使用修辞方法的一项是(         )。

如图，半径R=1m的光滑半圆轨道AC与倾角θ=37°的粗糙斜面轨道BD放在同一竖直平面内，两轨道之间由一条光滑水平轨道AB相连，B处用光滑小圆弧平滑连接．在水平轨道上，用挡板a、b两物块间的轻质弹簧挡住后处于静止状态，物块与弹簧不拴接．只放开左侧挡板，物块a恰好通过半圆轨道最高点C；只放开右侧挡板，物块b恰好能到达斜面轨道最高点D．已知物块a的质量为m₁=2kg，物块b的质量为m₂=1kg，物块与斜面间的动摩擦因数为μ=0.5，物块到达A点或B点时已和弹簧分离．重力加速度g取10m/s²，sin37°=0.6，cos37°=0.8，求：