锅炉排污分为（）排污和（）排污两种。

影响牙周疾病流行的因素不包括

A．口腔卫生

B．吸烟

C．刷牙习惯

D．饮酒

E．牙菌斑

阅读理解

     In their book Time to Eat the Dog: The Real Guide to Sustainable Living, Robert and Brenda

Vale say keeping a mediumsized dog has the same ecological impact as driving 10,000 km a year

in a 4.6 liter Land Cruiser.

     "We're not actually saying it is time to eat the dog. We're just saying that we need to think about

and know the ecological impact of some of the things we do and that we take for granted."

     Constructing and driving the jeep for a year requires 0.41 hectares of land, while growing and

manufacturing a dog's food takes about 0.84 hectares-or 1.1 hectares in the case of a large dog

such as a German shepherd.

     Convincing flesheating cats and dogs to go vegetarian for the sake of the planet is a nonstarter,

the Vales say. Instead they recommend keeping "greener", smaller, and more sustainable pets, such

as goldfish, chickens or rabbits.

    The book's playful title, and serious suggestion that pet animals may be usefully "recycled", by

being eaten by their owners or turned into pet food when they die, may not appeal to animal fans.

Annoying as the idea may be, the question is valid given the planet's growing population and limited

resources, Robert Vale said.

     "Issues about sustainability are increasingly becoming things that are going to require us to make

choices which are as difficult as eating your dog. It's not just about changing your light bulbs or taking

a cloth bag to the supermarket," he said.

    "It's about much more challenging and difficult issues," he added. "Once you see where cats and

dogs fit in your overall balance of things, you might decide to have the cat but not also to have the

two cars and the three bathrooms and be a meat eater yourself."

1. The authors gave their book the playful title to ________.

A. make it amusing        

B. create a vivid image

C. show writing skills      

D. arouse people's concern

2. In Paragraph 3 the writer mainly wants to tell us ________. 

A. the amount of consumed land

B. the neglected ecological impact

C. some familiar examples

D. some actual figures

3. Who may not like the idea of "recycling" pet animals? 

A. Manufacturers.            

B. Drivers.

C. Animal fans.              

D. The authorities.

4. What do the authors think of living a sustainable life?

A. Challenging.              

B. Inspiring.

C. Inviting.                  

D. Touching.

根据数据库应用系统生命周期模型，完成数据库关系模式设计的阶段是______。

A) 需求分析
B) 概念设计
C) 逻辑设计
D) 物理设计

农作物肥料的三大要素是（）

A.镁、氨、硅

B.硅、钾、磷

C.镁、磷、钾

D.氮、磷、钾

硼酸