A：2C㎡
B：4C㎡
C：8c㎡
下列各项中，属于光合作用产物的一组是（ ）
近代以来，传统的消费等级观念被打破，形成了“等威不能辨，贵贱不能别”的局面。道学之士惊叹当时的社会“凡事任意僭越。各处皆然，沪上尤胜”。造成上述变化的因素包括（ ）
①西方工业文明的影响 ②近代民族资本主义经济发展的推动
③近代中国社会政治文化运动的变革 ④近代中国社会中的等级观念被消除
Yesterday my sister and I went____(buy)something for her birthday．She didn't really know what____(get)but she seemed____(like)the idea of a pet，so we went to the nearest pet shop．She started ____(look)around at an the animals．The man in the shop advised her ____(choose)the rabbits，but when she saw some puppies(小狗) ____(play)in the box，she said she would like____(have)one of them．I didn't know if we had enough money____(buy)one and I hoped my mother would want us____(have)a dog in the house，but my sister promised____(look after)it well and we had enough money，so we bought a little brown dog.
从距离地面5m的高处将质量为0.5kg的物块以5m/s的速度水平抛出，不计空气阻力，g取10m/s2．求：
