All over the world people enjoy sports. Sports help to keep people healthy and happy, and to live longer. ___51__. They buy tickets or turn on their TVs to watch the games .Often they get very exc
在化学实验中，常常依据反应伴随的现象判断化学反应是否发生。请依次写出伴随发光、放出气体、生成沉淀三种不同现象，且属于不同基本反应类型
下列属于生物相对性状的是 A．豌豆的圆粒和皱粒 B．水稻的高茎和小麦的矮茎 C．人的蓝眼和双眼皮 D．兔的白毛与狗的黑毛
下图是“我国城市化发展阶段示意图”读图回答以下2题。 27．阶段I中，我国城市化进程正处于 （ ） A.初期阶段
(1)氯酸钾熔化，粒子间克服的作用力是________；二氧化硅熔化，粒子间克服的作用力是________；碘的升华，粒子间克服的作用力是________。三种晶体的熔
42. Little _____ about his own health though he was very ill. A. he cared B. did he care C. he cares D. does he care
—Do you know that Tom fell off his bike and broke his leg this morning? —Really? bad news! I'm sorry to hear that. A. What B. What
如图，在平面直角坐标系中,四边形OABC是正方形，点A的坐标是(4，0)，点P为边AB上一点，∠CPB=，沿CP折叠正方形折叠后，点B落在平面内处,则的坐标为（
