问几个英语问题1,餐饮业怎么用英语说?2,which of the following is an initialism

问几个英语问题
1,餐饮业怎么用英语说?
2,which of the following is an initialism?
A,UN B,NATO C,BASIC D,UNESCO
initialism 与acronym的区别?
3,what is a phrase structure rule?(关于语言学的知识)
还有个简单打算那时容易混淆的问题:
be used to do
used to do
和be used to doing区别用法

1,餐饮业怎么用英语说?
F&B Food and Beverage
2,which of the following is an initialism?
A,UN B,NATO C,BASIC D,UNESCO
initialism 与acronym的区别?
选A,ACRONYM和INITIALISM的区别主要在读音方式上.前者按单词读,后者一个字母一个字母的读.
Wikipedia,the Free Encyclopedia
Acronyms and initialisms are abbreviations formed from the initial letter or letters of words,such as NATO and XHTML,and are pronounced in a way that is distinct from the full pronunciation of what the letters stand for.
Of the two words,acronym is the much more frequently used and known,and many speakers and writers refer to all abbreviations formed from initial letters as acronyms.However,some differentiate between acronyms and initialisms:an acronym is a pronounceable word formed from the initial letter or letters of the constituent words,such as NATO (nay-toe),and an initialism is an abbreviation pronounced as the names of the individual letters,and is formed only from the initial letter of constituent words,such as TLA (tee el ay).This distinction is supported by many dictionary definitions,but not by all.
3,what is a phrase structure rule?(关于语言学的知识)
Phrase structure rule (短语结构规则)：
The special type of grammatical mechanism that regulates the arrangement of elements that make up a phrase.