题目

沉积岩区别于其他种类岩石的主要特征是( ) A . 有明显的矿物晶体颗粒或气孔 B . 有明显的柱状结构 C . 有明显的层状结构或化石 D . 常有片状结构 答案：C Life in modern cities become busier．Some people think we can't raise pets such as cats or dogs．We should spend our time on other things such as work．In my opinion，l think raising pets can relieve（减轻）our burden（压力）of life． Pets such as cats and dogs can bring us pleasure when we feel lonely and need a company. Pets can entertain（使快乐）us．Maybe some people think we have no time to raise pets．But raising pets doesn't need a lot of time if we're not too lazy．In fact, raising pets isn't complicated（复杂的）．What we have to do to raise them is washing them，taking food to them and so on，Even if they have no use for anything，they'll not take you much time or energy． In a word，pets will become our friends，we shouldn't be afraid of spending much time raising them．If you try to raise them．you'll find the interest in busy life． 1、How is life in modern cities? 2、Why should we raise pets? 3、When do we need a company? 4、What do we have to do to raise pets? 5、Is raising pets complicated?