史载：“置御史大夫，位次丞相，典正法度，以职相参，总领百官，上下相监临。”由此可见，御史大夫行使（    ）

生物多样性包括了____、____和____．

    It was Saturday. Mike stayed at home alone(单独地). His parents went to visit his grandparents in another city. He did his homework and read books. After lunch, he watched TV and played basketball on the playground with Jack. He felt very tired. In the evening, his parents came back and brought him some presents. They were a schoolbag and a basketball. Mike felt very excited!

在“比较串联电路和并联电路”的实验中，连接电路时，开关必须____．某实验小组连好如图所示的电路时，闭合开关，发现两灯都不亮，急忙向老师求援．老师走过来，将L₁轻轻扭动，L₁ 亮起来了，L₂还是不亮．老师微笑着问：“这说明L₁处发生了什么故障？”同学们异口同声地回答道：“接触不良．”“那么L₂为什么还不亮呢？”同学们又傻眼了…如果 L₂处有故障，是什么故障呢？你认为L₂发生____．