纯电阻电路中，电流与电压的关系是符合欧姆定律的。（）

某同学在研究下列两幅图片后，对该阶段中国古代社会的变化特征得出一些感悟，你认为正确的是

西周分封制示意图                   秦朝郡县制示意图

①从贵族体制到官僚体制                ②从世袭到任命

③从地方分治到中央集权                ④从分裂到统一

A．①②③

B．①③④

C．②③④

D．①②③④

Until recently, scientists knew little about life in the deep sea, nor had they reason to believe that it was being threatened. Now, with the benefit of technology that allows for deeper exploration, researchers have uncovered a remarkable array of species inhabiting the ocean floor at depths of more than 660 feet, or about 200 meters. At the same time, however, technology has also enabled fishermen to reach far deeper than ever before, into areas where bottom trawls can destroy in minutes what has taken nature hundreds and in some cases thousands of years to build. Many of the world’s coral species, for example, are found at depths of more than 200 meters. It is also estimated that roughly half of the world’s highest seamounts—areas that rise from the ocean floor and are particularly rich in marine life—are also found in the deep ocean. These deep sea ecosystems provide shelter, spawning and breeding areas for fish and other creatures, as well as protection from p currents and predators. Moreover, they are believed to harbor some of the most extensive reservoirs of life on earth, with estimates ranging from 500,000 to 100 million species inhabiting these largely unexplored and highly fragile ecosystems.Yet just as we are beginning to recognize the tremendous diversity of life in these areas, along with the potential benefits newly found species may hold for human society in the form of potential food products and new medicines, they are at risk of being lost forever. With enhanced ability both to identify where these species-rich areas are located and to trawl in deeper water than before, commercial fishing vessels are now beginning to reach down with nets the size of football fields, catching everything in their path while simultaneously crashing fragile corals and breaking up the delicate structure of reefs and seamounts that provide critical habitat to the countless species of fish and other marine life that inhabit the deep ocean floor.Because deep sea bottom trawling is a recent phenomenon, the damage that has been done is still limited. If steps are taken quickly to prevent this kind of destructive activity from occurring on the high seas, the benefits both to the marine environment and to future generations are incalculable. And they far outweigh the short-term costs to the fishing industry.

书面表达。

     假如你班要就“如何为高考作准备”开一个班会，请根据以下内容写一篇发言稿，

谈谈你对高考备考过程中要注意的事项及建议理由：

1.保持良好的心态有助于减轻焦虑，还能增强克服困难的勇气；

2.与父母，老师或同学沟通，帮助走出困境；

3.作息合理，饮食均衡，以保持旺盛的精力。

注意：

      1.词数100左右，开头以为你写好（不计入总词数）；

      2.可适当增加细节，以使行文连贯。

No doubt every Senior 3 student wishes to be successful in the National College Entrance Examination.

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麻醉药品连续使用后易产生瘾癖以及

A．精神依赖性
B．身体依赖性
C．兴奋性
D．抑制性
E．二重性

下面代码运行后，s的值是（）。

A.20

B.12

C.10

D.6