治疗风湿痹痛，四肢拘挛，腰膝酸软，小儿行迟，应选用的药物是（） A.独活 B.牛

Many people consider the wider use of biofuels a promising way of reducing the amount of surplus carbon dioxide (CO₂) being pumped into the air by the world’s mechanized transport. The theory is that plants such as sugar cane, maize (corn, to Americans), oilseed rape and wheat take up CO₂ during their growth, so burning fuels made from them should have no net effect on the amount of that gas in the atmosphere.

Theory, though, does not always translate into practice, and just as governments have committed themselves to the greater use of biofuels, questions are being raised about how green this form of energy really is. The latest comes from the International Council for Science (ICSU) based in Paris.

The ICSU report concludes that, so far, the production of biofuels has aggravated rather than ameliorated global warming. In particular, it supports some controversial findings published in 2007 by Paul Crutzen of the Max Planck Institute for Chemistry in Germany. Dr. Crutzen concluded that most analyses had underestimated the importance to global warming of a gas called nitrous oxide (N₂O). The amount of this gas released by farming biofuel crops such as maize and rape probably negates by itself any advantage offered by reduced emissions of CO₂.

Although N₂O is not common in the Earth’s atmosphere, it is a more potent greenhouse gas than CO₂ and it hangs around longer. The result is that, over the course of a century, its ability to warm the planet is almost 300 times that of an equivalent mass of CO₂.

N₂O is made by bacteria that live in soil and water and, these days, their raw material is often the nitrogen-rich fertiliser that modern farming requires. Since the 1960s the amount of fertiliser used by farmers has increased sixfold, and not all of that extra nitrogen ends up in their crops. Maize, in particular, is described by experts in the field as a “nitrogen-leaky” plant because it has shallow roots and takes up nitrogen for only a few months of the year. This would make maize (which is one of the main sources of biofuel) a particularly bad contributor to global N₂O emissions.

But it is not just biofuels that are to blame. The ICSU report suggests N₂O emissions in general are probably more important than had been realised. Previous studies, including those by the International Panel on Climate Change (IPCC), a United Nations-appointed body of experts, may have miscalculated their significance — and according to Adrian Williams of Cranfield University, in Britain, even the IPCC’s approach suggests that the global-warming potential of most of Britain’s annual crops is dominated by N₂O emissions.

Scientists realize that maize（）

A. contributes little to global N₂O emissions

B. absorbs nitrogen very efficiently in crops

C. is largely responsible for the surplus N₂O

D. may experience a bad harvest for bacteria

下列各句加点词语使用恰当的一项是（  ）

A．防止疫情流行，是“5·12”汶川特大地震后灾区刻不容缓的头等大事。

B．用心观察，你就会发现平凡的生活能为我们提供巧夺天工的作文素材。

C．在外漂泊十多年的他见到亲人时终于忍俊不禁，留下了辛酸的眼泪。

D．为了备战空前绝后的北京奥运会，全国上下都在同心协力争创佳绩。

女，47岁。缺失，需固定修复。如果设计不当，固定义齿易产生整体（）

A.近中移动

B.远中移动

C.移动

D.龈向移动

E.唇颊向移动

东方式插花特点是（）

A.选材简洁，所用材料数量不多，追求花枝或枝干的自然神韵

B.用色清新淡雅，有时也用浓重艳丽的色彩，如牡丹，但一般只用2～3种花色，简洁明了

C.多以线条构图为主，图形追求不规则、不对称的自然美

D.插制方法是以三大主枝为骨架的线条式插法

E.强调插花作品的意境美和内在神韵美。意境深远和富有诗情画意是东方式插花的主要艺术表现手法

简述专变采集终端（230M）现场防止用户开关误跳闸所采取的预防控制措施。