____ 法律是保护公民合法财产所有权的锐利武器。____ 法律是保护公民财产所有权的重要武器。

把$\sqrt{\frac{8}{9}}$化为最简二次根式是（　　）

将下列动物与对应的主要运动方式和所属的类群进行分类

蜻蜓  ____    A跳跃                            a哺乳动物

鲤鱼____      B飞行                            b鸟类                        

袋鼠____      C游泳                            c鱼类

鸵鸟____      D奔跑                            d昆虫

    There are____styles in clothing. Some styles are____——they stay popular____a long time and never go____out of fashion. They may be enduring favourites for several ____, or even generations.

    ____other living things, people need nourishment to live. Food____the energy needed for____activities, from____ actions such as breathing and sleeping to more ____activities such as sports.