Americans consider baseball as an American sport阅读理解答案_高三_中学数学网
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Americans&consider&baseball&as&an&American&sport阅读理解答案
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Americans&consider&baseball&as&an&American&sport阅读理解答案
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Americans consider baseball as an American sport. They often refer to something being “as American as baseball and apple pie”. But is baseball really an American sport? And what are origins of baseball anyway?The American game of baseball more than likely came from several European ball games. Russia had an early form of baseball and so did Germany and Romania. People in England played a game called “stool ball”. In this game, the pitcher(投手)tried to hit a stool(凳子)or chair with a ball and the batter(击球手)used a stick to keep the ball away. But American baseball was most likely based on another English game, which is called “rounders”. Players use a soft ball rater than a hard ball while playing rounders.So when was the first real game of “baseball” played? It seems that it took place in the 1840s. The father of baseball was Alexander Cartwright, who organized a baseball club in New York. Cartwright developed 20 rules that distinguished baseball from previous ball games.In 1858, the first organized baseball league―the National Association of Baseball players―was formed. This league began charging fans to watch the games. However, the players were all amateurs and did not get paid . In 1869, the Cincinnati Red Stockings began to pay their players. Since they could hire the best players, Cincinnati won 57 games and lost none in their first season. As a result, other teams decided to hire players too. By 1871, the National Association was the first professional baseball league.Today baseball is liked very much in America. Top professional baseball players earn millions of dollars each year. There are two professional leagues―the National League and the American League. The best teams from these two leagues compete for the baseball championship every year.小题1:81.What do Americans think of baseball? (No more than 3 words)2’小题2:82. Why was Alexander Cartwright called “the father of baseball ”?(No more than 16 words).3’小题3:83. Where did the American baseball most probably come from?(No more than 5 words).2’小题4:84.What does the passage mainly talk about?(No more than 5 words).3’
1:An American sport小题2:Because he organized a baseball club and developed 20rules distinguishing baseball fromprevious ball games 小题3:An English gamecalled“rounders” 小题4:The history of American baseball
试题分析：【文章大意】本文是一篇说明文。文章介绍了美国棒球的发展史。小题1:An American sport 或 Very important考查同义句表达。根据文章第一段中的Americans consider baseball as an American sport.可知答案；小题2:Because he organized a baseball club and developed 20rules distinguishing baseball fromprevious ball games 根据文章第三段中的The father of baseball was Alexander Cartwright, who organized a baseball club in New York. Cartwright developed 20 rules that distinguished baseball from previous ball games.可提炼出答案；小题3:An English gamecalled“rounders” 根据第二段中的American baseball was most likely based on another English game, which is called “rounders”. Players use a soft ball rater than a hard ball while playing rounders.可知答案；小题4:The history of American baseball 考查文章主旨要义。根据文章第一段提出的问题可知，本文主要讲的是美国棒球的历史。
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在书面音标中的“清辅音/s/+清辅音/k,p,t/+元音”组合里，如果这个元音承担单词重音，那么，清辅音在实际发音时要浊化为/g,b,d/，例如s[ch]ool...
p和b, t和d有些难区别，k和g不是很难区别，多听几遍就没事了。
理论上，P、T是轻辅音，发音时候不振动声带，B和D是浊辅音，发音的时候声带振动。
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出门在外也不愁用BF609的SPORT读取AD7606的Bug解决方法
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用BF609的SPORT读取AD7606的Bug解决方法
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用BF609的SPORT读取AD7606的Bug解决方法
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1.硬件框图：
Bug：通过SPORT读取的数据有怪点，怪点的值为正常值的2倍，且两个怪点的距离为20个点；如图（正常应该是平滑的正弦波）：
可以排除AD7606本身输出数据不正确的原因，将bug锁定在SPORT读的问题，或者说是SPORT读数据的时序问题；
设定7606的量程为5V，第一通道的输入数据为5V，那么AD7606的理论输出值应该是0x7FFF；
用示波器抓取实际波形如图：
从时序上看，实际波形与理论输出值是相符合的，为0x7FFF；但这只能说明这次抓波没有找到怪点；
尝试修改SPORT CLK，FS的配置（只有这两个地方会产生时序问题），发现：
驱动中配置CLK,FS如下：
&这样的配置对应的波形输出如下：
就像图片里添加的文字所说，这种配置让读到的所有数据左移了一位，从而造成读取值翻倍；
但这种配置不会出现怪点！
为了避免无解的怪点，我采用了这种配置，因为读取值左移了一位，需要右移一位，不足之处在于：造成了1位误差，相当于16位的ADC，只有15位是有效的。当量程为+-5V时，这个误差是LSB=152uV；当量程为+-10V时，这个误差是LSB=304uV；&PS：对这种高精度的ADC来说，模拟电源的要求很高，电源纹波&152uV，以上的误差就可以忽略不计了；
两种现象的因果关系是这样的：软件配置--&输出波形不同--&读取数据不对--&实际结果不同
可以用截图表示出来，第一种情况：
1.软件配置：
2.输出波形：&
3.发现跳点：&
4.打印结果：
第二种情况：
&OK，既然所以结果都是那两处配置引起，不妨再试另外两种组合。
&结果与以上第二种情况一样
输出值不正确，而且是不确定的；
在本项目中，两个地方用的了SPORT来产生SPI的时序，都出现了问题，而且很难解决；
对于ADI的SPORT来说，他不是全能的串口，在BF609的手册Page1627第一句就有说，SPORT不兼容SPI；
以此，谨记！
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