下面句子排列顺序最恰当的一项是（       ）
①2012年3月，奥巴马政府宣布将斥资180亿美元防止五大湖遭亚洲鲤鱼入侵
②亚洲鲤鱼是指原产于亚洲的鲤鱼，也是美国人对青鱼、草鱼、鳙鱼、鲤鱼、鲢鱼等8种鱼的统称
③它们不仅繁殖迅速，也给水中其它生物种群，比如鲑鱼，带来灭顶之灾，并有向美国五大湖蔓延势
④但随着数量的增加，亚洲鲤鱼已经危害到当地的生态环境
⑤为保护当地的生态，美国政府于2009年底开始大规模捕杀亚洲鲤鱼
⑥美国曾于70年代从中国进口这些鱼类，以改善生态

      In 1826, a Frenchman named Niepce needed pictures for his business .But he was not a good artist .So he invented a very simple camera. He put it in a window of his house and took a picture of his garden .That was the first photo.
       The next important date in the history of photography (摄影) was in 1837. That year, Daguerre, another Frenchman, took a picture of his reading room .He used a new kind of camera in a different way. In his picture you could see everything very clearly, even the smallest thing. This kind of photo was called a Daguerreotype.
       Soon, other people began to use Daguerre's way. Travelers brought back wonderful photos from all around the world .people took picture of famous buildings, cities and mountains.
       In about 1840, photography was improved .Then photographers could take pictures of people and moving things .That was not simple .The photographers had to carry a lot of films and other machines. But this did not stop them, for example, some in the United States worked so hard.
       Mathew Brady was a famous American photographer. He took many pictures of great people .The pictures were unusual because they were very lifelike.
     Photography also became one kind of art by the end of the 19th century. Some photos were not just copies of the real world .They showed feelings like other kinds of art.

小明在显微镜下看到了下面的血管图，结合血液流动的局部模式图，回答以下问题．

（1）在显微镜下辨别三种血管的理由是：动脉内的血液由较____ （填“粗”或“细”）的血管流向较____ （填“粗”或“细”）而分支____ （填“多”或“少”）的血管；

（2）静脉内的血液是由较____ （填“粗”或“细”）而分支____ （填“多”

或“少”）的血管汇流入较____ （填“粗”或“细”）的血管；

（3）毛细血管内血液中的红细胞一般成____ 通过，血流速度____ ，该血管的结构特点是管壁由____ ，构成的．最慢

（4）由此可判断①是____ 血管，②是____ 血管，③是____ 血管

（5）若①②③为对应血管中血流速度，则血液流速关系表述为____ （请用图中的序号和“＞”表示）

按顺序写出以学的11个声母。

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