分析性职业流行病学调查，不包括A．病例—对照研究B．回顾性调查C．队列研究D．前瞻性

(6分)用作牙膏摩擦剂的轻质碳酸钙可以用矿石A来制备，某化学兴趣小组设计了2种转化流程，如下图所示。

已知：a．二氧化碳持续通入氢氧化钙溶液发生如下反应：

CO₂+Ca(OH)₂===CaCO₃↓+H₂O，  CaCO₃+ H₂O + CO₂===Ca(HCO₃)₂；

微热

      b．碳酸氢钙微溶于水，微热易分解：

         Ca(HCO₃)₂="====" CaCO₃↓+H₂O+ CO₂↑；

c．生石灰与水充分反应后可得到颗粒非常细小的熟石灰浆。

试填空。

(1)小王主张用流程①、②、④和操作Ⅱ的设计，认为其工艺简单。

请写出反应①和④的化学方程式：

①            ▲          ；④            ▲          ；

操作Ⅱ包括                           ▲                     等工序。

(2)制轻质碳酸钙时，D为     ▲    (选填“悬浊液”或“溶液”或“乳浊液”)，

理由是：                ▲                ．

(3)小李认为流程①、②、③和操作I比小王的主张更好，其理由是：_______________

             ▲          ；操作I包括搅拌和微热等工序。

B

I am a writer. I spend a great deal of my time thinking about the power of language — the way it can evoke（唤起）an emotion, a visual image, a complex idea, or a simple truth. Language is the tool of my trade. And I use them all—all the Englishes I grew up with.

Born into a Chinese family that had recently arrived in California, I’ve been giving more thought to the kind of English my mother speaks. Like others, I have described it to people as “broken” English. But I feel embarrassed to say that. It has always bothered me that I can think of no way to describe it other than “broken”, as if it were damaged and needed to be fixed, as if it lacked a certain wholeness. I’ve heard other terms used, “limited English,” for example. But they seem just as bad, as if everything is limited, including people’s perceptions (认识) of the limited English speaker.

I know this for a fact, because when I was growing up, my mother’s “limited” English limited my perception of her. I was ashamed of her English. I believed that her English reflected the quality of what she had to say. That is, because she expressed them imperfectly her thoughts were imperfect. And I had plenty of evidence to support me: the fact that people in department stores, at banks, and at restaurants did not take her seriously, did not give her good service, pretended not to understand her, or even acted as if they did not hear her.

I started writing fiction in 1985. And for reasons I won’t get into today, I began to write stories using all the Englishes I grew up with: the English she used with me, which for lack of a better term might be described as “broken”, and what I imagine to be her translation of her Chinese, her internal (内在的) language, and for that I sought to preserve the essence (本质), but neither an English nor a Chinese structure. I wanted to catch what language ability tests can never show: her intention, her feelings, the rhythms of her speech and the nature of her thoughts.

61. By saying “Language is the tool of my trade”, the author means that        .

A. she uses English in foreign trade       B. she is fascinated by languages

C. she works as a translator              D. she is a writer by profession

62. The author used to think of her mother’s English as       .

A. impolite       B. amusing           C. imperfect          D. practical

63. Which of the following is TRUE according to Paragraph 3?

A. Americans do not understand broken English.

B. The author’s mother was not respected sometimes.

C. The author’ mother had positive influence on her.

D. Broken English always reflects imperfect thoughts.

64. It can be inferred that the English the author’s mother used was        .

A. well structured                      B. in the old style

C. easy to translate                    D. rich in meaning

65. What is the passage mainly about?

A. The author’s experiences of using different Englishes.

B. The author’s misunderstanding of “limited” English.

C. The limitation of the author’s perception of her mother.

D. The changes of the author’s attitude to her mother’s English.

帘式涂布的优缺点？

《中华人民共和国水土保持法》于( )经第七届全国人民代表大会常务委员会第二十次会议通过并施行。

A．1991年6月29日

B．1991年6月30日

C．1991年7月29日

D．1991年7月30日

马歇尔-勒拿条件