in 1950s 与in the 1950s有什么区别?in 1950s是表示1950----1959还是1940---1949?in the 1950s呢?

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• in 1950s 与in the 1950s有什么区别?in 1950s是表示1950----1959还是1940---1949?in the 1950s呢?
• in 1950 ,in 1950s,in the 1950s,in the 1950's,in 1950's这四个短语都存在么?
• in the 18th century和in 18th century有区别吗?一篇英语阅读里面第一句：when tea and coffee were first introduced to Europe in the 18th century，第一个问题是tea and coffee were first introduced to Europe in______A______A 19th centuryB 18th centuryC in 1801D 1921只有in the 18th century=in 19th century时才能选择A啊难道in the 18th century和in 19th century指的都是1801~1900？那in 18th century指的就是1701~1800？