统计工作的基础是（）。 A.统计设计 B.统计调查 C.统计整理 D.统计分析

鸡蛋产出后，胚胎发育暂时停止，要使胚胎发育继续进行，必须提供的环境条件是

A．充足的营养物质

B．充足的水分

C．适宜的温度

D．充足的阳光

（7分）（1）从物质种类、各物质的质量关系和反应条件等方面考虑，S + O₂SO₂给你提供的信息是：反应物是             ；各物质的质量关系是                      

                                              ；反应条件是                。

（2）物质的某些性质可能对人类有利，也可能对人类不利。请仿照事例填写下表：

People have good reason to care about the welfare of animals. Ever since the Enlightenment, their treatment has been seen as a measure of mankind’s humanity. It is no coincidence that William Wilberforce and Sir Thomas Foxwell Buxton, two leaders of the movement to abolish the slave trade, helped found the Royal Society for the Prevention of Cruelty to Animals in the 1820s. An increasing number of people go further: mankind has a duty not to cause pain to animals that have the capacity to suffer. Both views have led people gradually to extend treatment once reserved for mankind to other species.

But when everyday lives are measured against such principles, they are fraught with contradictions. Those who would never dream of caging their cats and dogs guzzle bacon and eggs from ghastly factory farms. The abattoir and the cattle truck are secret places safely hidden from the meat-eater’s gaze and the child’s story book. Plenty of people who denounce the fur-trade (much of which is from farmed animals) quite happily wear leather (also from farmed animals).

Perhaps the inconsistency is understandable. After hundreds of years of thinking about it, people cannot agree on a system of rights for each other, so the ground is bound to get shakier still when animals are included. The trouble is that confusion and contradiction open the way to the extremist. And because scientific research is remote from most people’s lives, it is particularly vulnerable to their campaigns.

In fact, science should be the last target, wherever you draw the boundaries of animal welfare. For one thing, there is rarely an alternative to using animals in research. If there were, scientists would grasp it, because animal research is expensive and encircled by regulations. Animal research is also for a higher purpose than a full belly or an elegant outfit. The world needs new medicines and surgical procedures just as it needs the unknowable fruits of pure research.

And science is, by and large, kind to its animals. The couple of million (mainly rats and mice) that die in Britain’s laboratories are far better looked- after and far more humanely killed than the billion or so (mainly chickens ) on Britain’s farms. Indeed, if Darley Oaks makes up its loss of guinea pigs with turkeys or dairy cows, you can be fairly sure animal welfare in Britain has just taken a step backwards.

With which of the following statements would the author most probably agree（）

A. Even if they deplore the activitist’s use of intimidation and violence, animal lovers everywhere can sure rejoice today

B. Science does not deserve to be the target of protests, whatever you think of animal rights

C. Over the years something good has come from the campaign against the animal industry

D. It is a sensible move that Darley Oaks makes up its loss of guinea pigs with turkeys or dairy cows

关于音叉试验的描述哪项正确（）

A.是门诊最常用的听力检查方法之一

B.检查时，检查者手持叉臂

C.检查气导听力时，将振动的叉臂置于距鼓膜1cm处

D.检查气导听力时，两叉臂末端应与外耳道处于同一平面

E.检查骨导时，应将叉柄末端的底部压置于颅面上或鼓窦区

圆钢、管材弯曲件展开时是按（）计算的。

A、外径

B、内径

C、中心线

D、图样所给尺寸