阅读以下材料，回答问题：

我国古代的专制主义中央集权制度在两千多年的发展过程中,经历了一个形成、发展、巩固、强化的过程。

材料一：

材料二：“臣愚以为诸不在六艺（六经）之科、孔子之术者,皆绝其道,勿使并进。邪辟之说灭息,然后统纪可一而法度可明,民知所从矣。”——《汉书·董仲舒传》

材料三：明朝建立之后,朱元璋为了解决君相之争……于1380年,将丞相胡惟庸诛杀,在随后的十年里,大肆捕杀其党羽,株连杀戮3万余人,并对我国政治制度进行了重大改组。

材料四：清朝沿用明朝政治制度,内阁仍然是政府的中枢机构。但因受清朝建立并保留下来的议政王大臣会议的制约,权力有限,使皇帝集权受到较大影响……后来,清朝统治者对中央中枢机构进行了改组。

    How do you get pocket money from your parents? In the western countries, many ____ do housework to get pocket money. They usually start to do this ____ the age of ten.

    Jimmy is seven years old. Now he is ____ the dishes. He can only do this, so he can't get ____ money. But that's all right. He only wants to ____ candies.

    Jenny is twelve years old. She is ____ than Jimmy. She wants to buy many things. They are more expensive than candies.

    ____ she has to work harder! Now she is washing the car. If she ____ free time, she will cut grass, walk the dog or cook dinner.____ housework can help kids learn new things. For example, you can learn how to cook. Of course, your mother will help you at the ____ .

下列关于实验操作步骤的叙述，正确的是  

下列数据是一些物质的pH，其中呈碱性的是 （　　）