一千和两个500一样大。

运用声呐系统可以探测海洋深度．在与海平面垂直的方向上，声呐向海底发射超声波．如果经4s接收到来自大海底的回波信号．则该处的海深为____ m（海水中声速1500m/s）．

小华在2015年学业考试体育测试中，身高的读数为160____（填写合适的长度单位）．

阅读理解

    Baseball is one of the favorite sports in the USA. Children play baseball in sports fields or parks.

    At summer picnic, there is often an informal baseball game. Boys and girls, young and old take turns to bat. There are nine players on each team.

    The baseball season goes from April to September. During this time, baseball matches are showed on TV and members of the important baseball teams become America's heroes (英雄). At the end of the season, the two top teams play against each other. Many baseball fans go together to watch the game. Millions of others listen to the radio or watch the television. People seem to talk only about the game. Even long after it is over, they still talk about the result and the players.

    American football is perhaps the most popular sport in the USA. The football season begins when the baseball season ends. More people are interested in football than baseball. When there is an important game, thousands of people sit beside radios or in front of television sets to get the result.

最有资格代表南极的动物是---------，---------是北极的象征（    ）

依次填入下面一段文字横线处的语句，衔接最恰当的一组是(     )
近年来出现了所谓国学热。　　　　　　　　　　　。重要的不是意见之争，而是学理或技术性争论。
①就像自然生态需要多样性，不能随便说哪个物种是“坏的”，更不能随便认为哪种文化不应该存在。②关于国学到底“好不好”这样的问题几乎没有意义。③但居然演变成一种“轻浮”的文化争论，这就让人失望了。④何况国学存在数千年，自有其伟大力量和深刻道理。⑤过于随便地进行批判，没有任何建设性。⑥国人对国学有兴趣，本是理所当然的事。