根据短文理解，选择正确答案填空。 

    Jim is a junior high school student. He gets up 16:30 every morning. His home is near his school. He 2home after breakfast. He goes to school on foot. This is good for his 3. He has four lessons in the morning. He has lunch at home. After lunch he goes to school again. In the afternoon, Jim has lessons . He likes English and PE lessons. He has PE lessons on Tuesday and Friday. He is good at4football and basketball. He is also good at the high jump. His PE teacher likes5 very much. He often plays football with his classmates after school.

近代中国由于《南京条约》《马关条约》《辛丑条约》等一系列不平等条约的签订，一步步陷入半殖民地半封建社会的深渊。下列对这一社会的认识，正确的是（   ）

①形式上独立，实际上被帝国主义间接统治

②政治上是半殖民地的，经济上是半封建的

③“半殖民地”是指丧失了部分的国家独立自主权

④“半封建”是指既保存了封建主义，又发展了资本主义

为了探究光的反射规律，小明用如图所示的装置进行实验，平面镜置于水平桌面上．把一可沿ON折叠的白色硬纸板竖直放置在平面镜M上．

近代英、法、美资产阶级革命后均确立了代议制民主政治。代议制的核心是