1912年3月，南京临时政府令：“查前清官厅，视官之高下，有大人、老爷等名称，受之者增惭，施之者失体。……光复以后，闻中央地方各官厅，漫不加察，仍沿旧称，殊为共和政体之玷。”有研究者发现，同年6月《申报》载：“公堂会审之时，（被告）就口口声声以老爷、大人相称，裁判官亦直受不辞。”上述材料最宜作为下列哪一观点的论据

修建大型水库，可能引发的自然灾害是（    ）

①In order to protect our environment, we can't freely cut trees without the government's ____(允许)．

②There is no ____ (通路) to the street through that door.

③Humor is a more effective ____(防御) than violence(暴力)．

④Now that you are a college student, you should learn to be ____ (独立的)of your parents' help.

⑤Can you give me a ____(明确的)answer by tomorrow?

⑥With his new method, the time of the project will be ____ (缩短)．

⑦They brought the piano ____(斜着地) through the front door.