人类是在什么时候进入原子操作时代的（）A、本世纪初B、上个世纪五十年代C、上个世纪六

There have been several claims to have cloned humans over the past few years. Most have been bogus. But the announcement made this week by Woo Suk Hwang, of Seoul National University in South Korea, and his colleagues, is serious. It is the first to achieve the accolade of publication in a peer-reviewed scientific journal. Dr. Hwang s work appears in Science.

The terminology of human development has become slippery over the past few years, in the hands of both "life-begins-at-conception" propagandists who want to stop this sort of research, and publicity-seeking scientists who have claimed more than they have really achieved. What Dr. Hwang and his team have created is not what developmental biologists would normally refer to as an embryo. But it is a genuine scientific advance. South Korea’s researchers have taken egg cells from volunteer women, removed the nuclei from those cells (which contain only half of the genetic complement required to make a human being, since the other half is provided by the sperm), and replaced each nucleus with one taken from one of the volunteer’s body cells (which contains a full genetic complement). Given a suitable chemical kick-start, such re-nucleated cells will begin dividing as though they were eggs that had been fertilised in the more traditional manner. Since they have all of the mother’s genes, they count as clones.

Then the team cultured the dividing eggs until they had formed structures called blastocysts, with a few dozen cells each. This is the significant advance. At this stage the structure, though still just a featureless ball of cells, has started to differentiate into the body’s three basic cell types (known as endoderm, mesoderm and ectoderm). The researchers were able to extract cells from some of their blastocysts, and grow tissues containing all three cell types.

These are so-called stem cells, which can be directed to form a wide variety of the specialised cells from which organs are built. That, not the creation of new human beings, is the stated reason for this sort of research, since specialised cells made this way might be used to replace the cells lost in diseases such as Parkinson’s and type-Ⅰ diabetes. This process is known as therapeutic cloning.

No doubt Dr Hwang’s scientific success will sharpen the debate between those who see therapeutic cloning as a potential force for good, and those who see it as a step on the road to a cloned human being. The former have been queuing up to praise the scientist’s work. It is "a major medical milestone" that could help spur a "revolution", said Robert Lanza, a cloning expert.

But opponents of therapeutic cloning should not worry too much yet. The road from a blastocyst to a baby is a long and complex one. Nevertheless, the South Korean breakthrough makes it more urgent than ever that legislation be passed differentiating clearly between therapeutic and reproductive cloning—permitting the former and prohibiting the latter.

What does the word "bogus" (Line 2) most probably mean().

A. Different.

B. Fake.

C. Bold.

D. Genuine.

湖南常宁（水口山）的著名矿产是[ ]

A．锡矿

B．汞矿

C．锑矿

D．铅锌矿

2011年11月，国务院通报表彰了个省级人民政府，山东省位列第一。阅读材料，回答问题。

材料一：山东省政府在广泛听取社会各界意见和建议的基础上，出台了《关于进一步加强节能减排工作的意见》，大力调整产业结构，进一步强化了减排项目运行管理，确保治污设施稳定运行，严格日常环境监管和环保专项行动并行，依法累计关停小火电机组总容量717万千瓦，淘汰落后钢、铁产能527万吨和821万吨。

（1）运用政治生活知识，说明山东省政府在节能减排工作中是怎样发挥作用的？

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材料二：“十一五”时期山东省节能减排有关目标实现情况及“十二五”目标。

白芍的来源是（）

A、大戟科

B、木兰科

C、毛茛科

D、伞形科

E、菊科

检定变送器时，输入电压线路与输入电流线路之间、不同相别的输入电流线路之间的试验电压应为500V或2倍标称电压，取其中的较大值。