什么叫喘震？
参考答案：
当泵在不稳定区工作时，所产生的压力和流量的脉动现象，称为喘震。
我国对出口商品实行（）的原则。
A．征多少，退多少
B．末征税也退
C．末征不退
D．彻底退税
根据课文内容完成下面短文(注意括号中的提示)。
At the end of the 16th century, English was only spoken by people in England. They were native English
speakers. However, 1______ English language has changed quite a lot over the last four centuries. Old English
sounded more 2______ less like German for it was 3______ on German, but modern English sounds more like
French than German 4______ 1ater on England was once ruled by the French.
Two men had great 5______ (影响) on the English changes. One was Samuel Johnson, who wrote his
dictionary and the other was Noah Webster, 6______ wrote The American Dictionary of the English Language
7______ gave American English its own 8______ (身份).
Today, the largest number of people 9______ (speak) English may be in China. A lot of Chinese people
speak English 10______ a foreign language.
