在下列有关数字签名作用的叙述中，不正确的是()。A．接收方不能伪造发送方的签名 B．

产于广东的道地药材是（）。

A.附子

B.薄荷

C.细辛

D.陈皮

E.生地黄

临时消防救援场地宽度应满足消防车正常操作要求且不应小于（）m。

A.2

B.4

C.6

D.8

In their book Time to Eat the Dog : The Real Guide to Sustainable Living, Robort and Breanda Vale say keeping a medium-sized 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 are 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 0.41hectares of land ,while growing and manufacturing a dog’s food takes about 0.84 hectares or 1.1hectares in the case of a large dog such as a German shepherd.

Convincing flesh-eating cats and dogs to go vegetarian for the sake of the planet is a non-starter,

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

小题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

小题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

小题3:. What does “sustainability” mean according to the passage?

A Going vegetarian    B  Raising cats and dogs

C Using a cloth bag    D Keeping a greener life

小题4:. Who may not the idea of  “recycling” pet animal?

A Manufactures   B Drivers  C Animal fans  D The authorities

小题5:.  What do the authors thing of living a sustainable life?

A Challenging    B Inspiring   C Inviting  D Touching

被称为第一次世界大战中的“绞肉机”的战役是 [ ]

A．凡尔登战役  

B．德国突袭波兰  

C．斯大林格勒保卫战  

D．诺曼底登陆

土中某点处于极限平衡状态时，其应力圆与强度线的关系如何？