在8051单片机中，当RS1和RS0为11B时工作寄存器位于内部RAM的（）区域内。

阅读短文，选择正确答案。

    Big Ben is not the name of a man. It is the name of a big clock in London. London is the capital of England.

This clock has four faces. So, no matter (无论) where you stand, you can read the time on the face of Big Ben.

Each face is the size of a bus. The hands are about four meters long. It is about the size of two people standing

on top of each other. If you go to London, you may want to visit the Houses of Parliament (国会大厦). In that

place you will find Big Ben sits at the top of the clock tower in the Houses of Parliament. You will probably hear

it and see it. The big clock makes such a loud noise. 'Ding dong, ding dong.' It goes every quarter (四分之一)

of an hour. The name of Big Ben comes from a big builder.

1. Big Ben is _______. [ ]

A. a bus

B. a clock

C. the name of Ben

D. a house

2. Big Ben is in ________. [ ]

A. China

B. the USA

C. Japan

D. the UK

3. The clock strikes (敲) every _______ minutes of an hour. [ ]

A. ten

B. fifteen

C. thirty

D. forty-five

4. You can read the time of Big Ben _______. [ ]

A. at the top of the clock tower

B. in the Houses of Parliament

C. on the hands of the huge clock

D. on the four faces of the clock

5. The underlined (划线部分) word "hands" means _______ in Chinese. [ ]

A. 手

B. 标志

C. 指针

D. 发条

下列哪些处理剂常用于牙本质处理（）

A.磷酸溶液

B.草酸铁溶液

C.10-3溶液

D.羧酸

E.EEDTA溶液

下列有关叙述正确的是（　　）

A．种子结构中都有胚和胚乳

B．种子萌发时，子叶发育成叶子

C．水稻种子的营养物质主要贮存在胚乳里

D．小麦种子具有两片子叶

制不同类型风化壳形成的条件是（）、（）、（）等，其中最主要的是（）条件。

劳动纪律是根据劳动者的共同（）规定的，是劳动者自觉遵守的纪律，只对极少数违反纪律的职工执行强制性的纪律。

A、生产方式

B、利益

C、生活方式

D、工作秩序