我国古代的地动仪是世界上最早的地震仪，它出现在距今()。

A.两千多年前

B.五百多年前

C.一千八百多年前

D.一千二百多年前

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• 世界上第一台地震仪是我国科学家张衡在公元（），发明了地震仪.

  A、250

  B、180

  C、132

  D、158

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• Eastern Quakes Can Trigger Big Shakes In the first week of November 2011 , people in central Oklahoma experienced more than two dozen earthquakes. The largest, a magnitude (量)5.6 quake, shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV, you see reports about all sorts of natural disasters. But the most dangerous type of natural disaster, and also the most unpredictable, is the earthquake. Researchers at the US Geological Survey (USGS) estimate that several million earthquakes occur globally each year.That may sound scary, but people don’t feel many them because they happen in remote and unpopulated regions. Many quakes happen under the ocean, and others have a very small magnitude. scientists know about small, remote quakes only because of very sensitive electronic devices called seismometers (地震仪).These devices detect and measure the size of ground vibrations (震颤)produced by earthquakes. Altogether, USGS researchers use seismometers to identify and locate about 20, 000 earthquakes each year. Although earthquakes can happen anywhere in the world, really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen, on average, only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates (构造板块). Tectonic plates are huge pieces of Earth’s crust (外壳), sometimes many kilometers thick. Often, edges of these plates temporarily bck together. When plates push and scrape(擦)past each other earthquakes occur. On average, tectonic plates move very slowly — about the same speed as your fingernails grow. But sometimes earthquakes rumble (轰轰作响)through portions of the landscape far from a plate’s edges. Although less expected, these "mid-plate" small earthquakes can do substantial damage. Some of the biggest known examples hit the eastern half of the United States two centuries ago. Today, scientists are still puzzling over why the quakes occurred and when similar ones might occur. Big earthquakes of a magnitude 8 or higher seldom happen far from the edges of tectonic plates.
  A. RightB. WrongC. Not mentioned

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• 下列表述中，不正确的是（）

  A、地震仪记录的地震谱曲线越密，表明大地震动的频率越高

  B、地震发生后，纵波（P波）最先到达震中

  C、纵波（P波）的传播方向与地壳振动方向是一致的

  D、面波最后到达震中，震幅大，波长长，破坏力不大

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• 发明地动仪的是（　）。

  A.张衡

  B.毕昇

  C.哥白尼

  D.布鲁诺

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• 强国挑战答题答案：张衡发明的地动仪是中国古代科学的杰作。下面关于地动仪描述正确的是（）。

  A、地动仪是用青铜做成的

  B、仪器外部铸有八条铜龙，分别对应八个方向

  C、每条龙下方蹲着一只铜乌龟

  D、地动仪的形状像一个大酒坛

  E、地动仪可以预知雷雨天气

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